纳米Al_2O_3p/2024铝基复合材料的制备及往复镦—挤变形研究
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摘要
由于纳米颗粒具有大的比表面积和强的界面相互作用力,较传统的微米颗粒增强铝基复合材料,纳米颗粒增强铝基复合材料的比强度、比模量、耐蚀性、导电及导热性能等均有大幅度的提高,使其在航空航天、汽车工业以及其它领域具有更广阔的应用前景。然而,纳米颗粒增强铝基复合材料的制备比一般铝基复合材料更复杂和困难,这与纳米颗粒固有的物理、化学特性有关。制备纳米颗粒增强铝基复合材料的主要难点在于纳米增强相的均匀分散性和纳米增强相与基体之间的浸润性。迄今为止,适用于块体铝基纳米复合材料规模制备的技术仍然较少。
本文采用固液混合工艺制备纳米Al2O3p/2024铝基复合材料,较好地解决了金属基纳米复合材料制备过程中存在的由于外加纳米陶瓷颗粒润湿性差而难以加入金属熔体以及纳米颗粒在熔体中难以分散等关键问题。研究高能超声作用下固液混合纳米Al2O3p/2024铝基复合材料熔体的凝固组织及纳米A1203颗粒的再分布行为。采用往复镦-挤变形为主要变形方式,研究纳米Al2O3p/2024铝基复合材料在往复镦-挤变形过程中组织结构的演变规律及力学性能,揭示往复镦-挤变形特征及其组织细化机制,分析往复镦-挤纳米Al2O3p/2024铝基复合材料的强韧化机制。获得以下结果：
(1)利用有限元数值模拟方法分析了桨轮结构及混合工艺参数对固液混合过程中坩埚内熔体流动循环特征的影响。结果表明,桨轮结构及混合工艺参数对固液混合过程中坩埚内熔体流动行为影响显著。增加桨轮级数和桨轮直径以及减小桨叶倾斜角度均能有效地减少固液混合过程中坩埚内的搅拌低效区和“死区”。多级桨轮搅拌作用下,在坩埚中心区域形成强烈的湍流。桨叶倾斜角为30°时,各级桨轮所产生的强烈湍流犹如“螺旋”涡流。提高转速,坩埚内流体的流动行为逐渐由各级桨轮所形成的“自循环”特征向“整体大循环”特征转变,且在各级桨轮上下区域形成强烈的剪切区。
(2)中间纳米Al2O3p/Al复合粉体制备过程中,随着球磨时间的延长,纳米A1203颗粒在纯铝粉表面的均匀分散性显著提高；随着纳米A1203颗粒含量的增加,颗粒团聚现象明显。当纳米A1203颗粒含量为4wt.%,球磨12h,纳米A1203颗粒较为均匀地分散于纯铝粉表面。固液混合过程中,纳米A1203颗粒在润湿性较好的铝粉“载体”作用下顺利地进入铝熔液中,并在基体熔体中具有良好的颗粒分散性。基于显微组织的分析,建立了固液混合过程纳米A1203颗粒在基体熔体中的分散模型。
(3)将高能超声作用于固液混合纳米Al2O3p/2024复合材料熔体,其凝固组织显著细化。在超声场作用下,熔体温度过高、过低均减弱组织细化效果。随着超声时间的延长,组织细化程度逐渐下降。当熔体温度区间为650～670℃、超声功率300W、超声60s时,1.0wt.%纳米Al2O3p/2024铝基复合材料平均晶粒尺寸约为25μm。组织细化机制为过冷生核机制和空化活化机制。在常规模铸条件下,纳米Al2O3颗粒在基体晶界处和最后凝固区域偏聚；施加超声处理后,超声空化效应有利于改善Al2O3颗粒与熔体之间的润湿性,提高固液凝固界面对颗粒的“捕获”能力,在超声组织细化的协同作用下,从而有效地改善Al2O3颗粒在基体中的均匀分散性。
(4)利用往复镦-挤工艺对纳米Al2O3p/2024铝基复合材料进行大塑性变形时,首先采用有限元数值模拟技术分析了往复镦-挤变形过程中流场、温度场、应力场及应变场等相关场量的分布特征及其变化规律,接着进行相应的实验研究。结果表明,传统往复镦-挤变形过程中,变形试样易于形成镦粗“折皱”和挤压“中心孔”缺陷,材料内部等效应变分布较不均匀。采用改进的往复镦-挤变形方式能有效地避免上述缺陷,且材料内部等效应变均匀区域随着试样长度的延长而增加。增大模具过渡圆角半径及减小摩擦系数均能有效地改善试样内部等效应变分布的均匀性。往复镦-挤变形过程中,在镦粗变形段和挤压变形段各形成一对剪切变形区。改进的镦-挤变形流场模拟结果表明,镦-挤变形奇数道次后,试样表层流线网格由于摩擦阻碍而向后流动；偶数道次变形后,流线网格回复至初始状态特征；随着奇、偶数变形道次数的增加,其对应的流线网格特征均无显著变化。
(5)利用金相显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)和X射线衍射(XRD)等手段研究了改进的往复镦-挤变形对纳米Al2O3p/2024铝基复合材料组织结构的影响规律。结果表明,改进的往复镦-挤变形工艺对纳米Al2O3p/2024铝基复合材料基体具有强烈的组织细化能力,细化效率随着变形道次的增加而逐渐下降。变形温度越低或道次越多,组织越细小、均匀。经350℃往复镦-挤变形6道次后,基体平均晶粒尺寸约为5μm。基体晶粒细化机制为再结晶细化机制和交替剪切细化机制,第二相的细化机制为机械破碎。
(6)室温力学性能测试结果表明,T6态往复镦-挤纳米Al2O3p/2024铝基复合材料的抗拉强度和屈服强度随着镦-挤变形道次的增加呈先增后减,最后趋于平稳趋势。热挤压态1.0wt.%纳米Al2O3p/2024铝基复合材料T6处理后的抗拉强度为485MPa,屈服强度为382MPa; T6态往复镦-挤变形1道次复合材料的抗拉强度为492MPa,屈服强度为391MPa; T6态往复镦-挤变形4道次复合材料的抗拉强度降至477MPa,屈服强度为375MPa；此后拉伸强度无明显变化。随着变形道次的增加,复合材料塑性逐渐改善。初始态复合材料的延伸率仅为8.5%；镦-挤变形5道次复合材料延伸率增至13.5%。往复镦-挤纳米Al2O3p/2024复合材料综合力学性的提高是细晶强韧化、时效析出相强化和纳米Al2O3颗粒强化协同作用的结果。
Nano-size particle reinforced aluminum matrix composite, compared with the traditional micron particles reinforced aluminum matrix composite, presents the higher specific strength and specific modulus, corrosion and wear resistance, electrical conductivity, thermal conductivity due to the larger specific surface area and strong interface interaction of nanoparticles, which make them have a broader application prospects in the aerospace, automotive industry and other fields. However, the preparation of nano-particle reinforced aluminum matrix composite is more complex and difficult than the traditional aluminum composites due to the inherent physical and chemical properties of nanoparticles. The main difficulties of the preparation of nano-particle reinforced aluminum matrix composite lies in the uniform distribution of nanoparticle and the wetting bettwen the matrix and ceramic nanoparticle. Up to now, the technology is still less for the scaled-up preparation of bulk aluminum matrix nanocomposite.
In this dissertation, nano-Al2O3p/2024aluminum matrix composite was prepared by solid-liquid mixed casting process, which effectively solve the key problems associated with poor wettability between the nanoparticle reinforcement and the matrix melt, and nanoparticle clustering in the melt during the preparation of metal matrix nanocomposite. The solidified microstructure and particle re-distribution behavior of nano-Al2O3p/2024aluminum matrix composite melt processed by the high-intensity ultrasonic were investigated. The main deformation process performed on the nanocomposite was repeated upsetting and extrusion (RUE), and the microstructure evolution and tensile properties during the multi-pass upsetting and extrusion process were studied, and the refinement mechanism of the microstructure and the deformation mechanism of RUE process were indicated. The strengthening mechanism of as-RUE processed nano-Al2O3p/2024aluminum matrix composite was analyzed. The main conclusions were drawn as follows:
The flowing field of the fluid in the crucible during solid-liquid mixed process was simulated using finite element method (FEM). The effects of the stirrer geometry and some stirring process parameters on the flowing characteristics of the fluid were analyzed. The results showed that the stirrer geometry and processing parameters had significant effects on the flowing behavior of the fluid in the crucible. The multistage stirrer, lower blade angle and bigger diameter of the impeller were beneficial to reduce the mixing inefficient zone and "dead" zone in the crucible. Under the mixing action of multistage stirrer, a strong turbulence formed in the central region of the crucible. When the blade angle was30°, the turbulences generated by each impeller were like a "spiral" vortex. Increasing in the rotating speed, the flowing characteristics of the fluid in the crucible was gradually changing from "self-feeding" generated by each impeller to "the whole cycle", and the strong shear zone formed in the upper and lower regions of each impeller.
During the preparation of nano-Al2O3p/Al composite powders, with the extension of ball time, the distribution homogeneity of Al2O3nanoparticle on the surface of Al powder was obviously improved. With the increase of the content of Al2O3nanoparticle, the clustering tendency of Al2O3particles in the composite powder gradually increased. When the content of Al2O3nanoparticle was4wt.%, the as-received nanopowder of Al2O3particle was uniformly distributed on the surface of Al powder after the ball time of12h. During the solid-liquid mixed process, Al2O3nanoparticles were effectively incorporated into the matrix melt and well dispersed in the melt under the action of the Al powders carrier. Based on the microstructure analysis, a model about the dispersion of Al2O3nanoparticles in the melt during the solid-liquid mixed process was established.
When nano-Al2O3p/2024aluminum matrix composite melt prepared by the solid-liquid mixed process was processed by high-intensity ultrasonic, the solidified microstructure was obviously refined. The refinement efficiency was weaken on the too high or too low ultrasonic temperature. With the extension of ultrasonic time, the refinement efficiency gradually decreased. When the ultrasonic temperature was650～670℃, ultrasonic power was300W, and ultrasonic time was60s, the composite presented a fine uniform microstructure, which was composed of fine grains with an average size of25μm The Al2O3nanoparticles were pushed to grain boundary and final solidification regions in the normal casting condition. Under the condition of ultrasonic treatment, the transient cavitations could remove the gas layer from the nanoparticle surface, improving the wettability between nanoparticles and the matrix melt. Some Al2O3nanoparticulates were captured by the growing grain. As a result, the resulting distribution of Al2O3nanoparticles within the matrix was improved with the cooperation of ultrasound refinement of the microstructure.
Before the RUE deformation of nano-Al2O3p/2024aluminum matrix composite, the distribution characteristics and their evolution laws of flowing field, strain field, temperature field and stress field during RUE process were analyzed using FEM. And the releated experiments were carried out to further verify the simulation. The results indicated that the traditional RUE process easily led to the processing defects, such as the axile hole and the fold, and the strain distribution inside the material was very uneven. The processing defects were effectively avoided using the modified RUE, and the uniform region of equivalent strain inside the processed sample increased with the increase of the billet length. A bigger corner radius and smaller friction were helpful to improve the strain homogeneity inside the processed sample. The strong shear region formed in the each stage of modified RUE process. Flowing fields of modified RUE showed that the grid flow line on the surface of as-processed sample flowed backward due to the friction after the odd number pass, and after the even pass RUE deformation, the grid characteristics reverted to the initial state. With the increase of the odd and even deformation passes, the relevant flowing characteristics of the grid lines presented no significant change.
The microstructure evolution of nano-Al2O3p/2024aluminum matrix composite during modified RUE process was investigated by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results indicated that the matrix was effectively refined after modified RUE processing, and the grain refining efficiency decreased with the increase of RUE pass number. Lower deformation temperature and more deformation pass, the microstructure was more refine and homogeneous. After6pass RUE deformation at350℃, the average grain size of the matrix was5μm. The grain refining mechanisms of the matrix were consist of recrystallization refining mechanism and alternate shear refining mechanism. For the second phase, its refining mechanism was the mechanical cracking mechanism.
Room-temperature tensile test results showed that after T6heat treatment, the tensile strength of as-RUE processed nano-Al2O3p/2024aluminum matrix composite increased initially, reached a peak and there after decreased to attain a constant value with the increase of the RUE pass. The ultimate tensile strength (UTS) and yield strength (YS) of as-extruded nano-Al2O3p/2024aluminum matrix composite processed by T6heat treatment was485MPa,382MPa and8.5%, respectively. The UTS and YS of as-T6nano-Al2O3p/2024aluminum matrix composite processed after1RUE pass was492MPa and391MPa, respectively. The UTS and YS of as-T6nano-Al2O3p/2024aluminum matrix composite processed after4RUE pass was477MPa and375MPa, respectively. After that, the tensile property presented no significant change with the increase of RUE pass. With the increase of RUE pass, the elongation (δ) was obviously improved. After5RUE pass, the8increased from8.5%to13.5%. The improvement on the comprehensive tensile properties of as-processed nano-Al2O3p/2024aluminum matrix composite resulted from the combined action of grain refinement strengthening mechanism, the strengthening mechanism of the matrix precipitated phase and Al2O3nanoparticle.
本文采用固液混合工艺制备纳米Al2O3p/2024铝基复合材料,较好地解决了金属基纳米复合材料制备过程中存在的由于外加纳米陶瓷颗粒润湿性差而难以加入金属熔体以及纳米颗粒在熔体中难以分散等关键问题。研究高能超声作用下固液混合纳米Al2O3p/2024铝基复合材料熔体的凝固组织及纳米A1203颗粒的再分布行为。采用往复镦-挤变形为主要变形方式,研究纳米Al2O3p/2024铝基复合材料在往复镦-挤变形过程中组织结构的演变规律及力学性能,揭示往复镦-挤变形特征及其组织细化机制,分析往复镦-挤纳米Al2O3p/2024铝基复合材料的强韧化机制。获得以下结果：
(1)利用有限元数值模拟方法分析了桨轮结构及混合工艺参数对固液混合过程中坩埚内熔体流动循环特征的影响。结果表明,桨轮结构及混合工艺参数对固液混合过程中坩埚内熔体流动行为影响显著。增加桨轮级数和桨轮直径以及减小桨叶倾斜角度均能有效地减少固液混合过程中坩埚内的搅拌低效区和“死区”。多级桨轮搅拌作用下,在坩埚中心区域形成强烈的湍流。桨叶倾斜角为30°时,各级桨轮所产生的强烈湍流犹如“螺旋”涡流。提高转速,坩埚内流体的流动行为逐渐由各级桨轮所形成的“自循环”特征向“整体大循环”特征转变,且在各级桨轮上下区域形成强烈的剪切区。
(2)中间纳米Al2O3p/Al复合粉体制备过程中,随着球磨时间的延长,纳米A1203颗粒在纯铝粉表面的均匀分散性显著提高；随着纳米A1203颗粒含量的增加,颗粒团聚现象明显。当纳米A1203颗粒含量为4wt.%,球磨12h,纳米A1203颗粒较为均匀地分散于纯铝粉表面。固液混合过程中,纳米A1203颗粒在润湿性较好的铝粉“载体”作用下顺利地进入铝熔液中,并在基体熔体中具有良好的颗粒分散性。基于显微组织的分析,建立了固液混合过程纳米A1203颗粒在基体熔体中的分散模型。
(3)将高能超声作用于固液混合纳米Al2O3p/2024复合材料熔体,其凝固组织显著细化。在超声场作用下,熔体温度过高、过低均减弱组织细化效果。随着超声时间的延长,组织细化程度逐渐下降。当熔体温度区间为650～670℃、超声功率300W、超声60s时,1.0wt.%纳米Al2O3p/2024铝基复合材料平均晶粒尺寸约为25μm。组织细化机制为过冷生核机制和空化活化机制。在常规模铸条件下,纳米Al2O3颗粒在基体晶界处和最后凝固区域偏聚；施加超声处理后,超声空化效应有利于改善Al2O3颗粒与熔体之间的润湿性,提高固液凝固界面对颗粒的“捕获”能力,在超声组织细化的协同作用下,从而有效地改善Al2O3颗粒在基体中的均匀分散性。
(4)利用往复镦-挤工艺对纳米Al2O3p/2024铝基复合材料进行大塑性变形时,首先采用有限元数值模拟技术分析了往复镦-挤变形过程中流场、温度场、应力场及应变场等相关场量的分布特征及其变化规律,接着进行相应的实验研究。结果表明,传统往复镦-挤变形过程中,变形试样易于形成镦粗“折皱”和挤压“中心孔”缺陷,材料内部等效应变分布较不均匀。采用改进的往复镦-挤变形方式能有效地避免上述缺陷,且材料内部等效应变均匀区域随着试样长度的延长而增加。增大模具过渡圆角半径及减小摩擦系数均能有效地改善试样内部等效应变分布的均匀性。往复镦-挤变形过程中,在镦粗变形段和挤压变形段各形成一对剪切变形区。改进的镦-挤变形流场模拟结果表明,镦-挤变形奇数道次后,试样表层流线网格由于摩擦阻碍而向后流动；偶数道次变形后,流线网格回复至初始状态特征；随着奇、偶数变形道次数的增加,其对应的流线网格特征均无显著变化。
(5)利用金相显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)和X射线衍射(XRD)等手段研究了改进的往复镦-挤变形对纳米Al2O3p/2024铝基复合材料组织结构的影响规律。结果表明,改进的往复镦-挤变形工艺对纳米Al2O3p/2024铝基复合材料基体具有强烈的组织细化能力,细化效率随着变形道次的增加而逐渐下降。变形温度越低或道次越多,组织越细小、均匀。经350℃往复镦-挤变形6道次后,基体平均晶粒尺寸约为5μm。基体晶粒细化机制为再结晶细化机制和交替剪切细化机制,第二相的细化机制为机械破碎。
(6)室温力学性能测试结果表明,T6态往复镦-挤纳米Al2O3p/2024铝基复合材料的抗拉强度和屈服强度随着镦-挤变形道次的增加呈先增后减,最后趋于平稳趋势。热挤压态1.0wt.%纳米Al2O3p/2024铝基复合材料T6处理后的抗拉强度为485MPa,屈服强度为382MPa; T6态往复镦-挤变形1道次复合材料的抗拉强度为492MPa,屈服强度为391MPa; T6态往复镦-挤变形4道次复合材料的抗拉强度降至477MPa,屈服强度为375MPa；此后拉伸强度无明显变化。随着变形道次的增加,复合材料塑性逐渐改善。初始态复合材料的延伸率仅为8.5%；镦-挤变形5道次复合材料延伸率增至13.5%。往复镦-挤纳米Al2O3p/2024复合材料综合力学性的提高是细晶强韧化、时效析出相强化和纳米Al2O3颗粒强化协同作用的结果。
Nano-size particle reinforced aluminum matrix composite, compared with the traditional micron particles reinforced aluminum matrix composite, presents the higher specific strength and specific modulus, corrosion and wear resistance, electrical conductivity, thermal conductivity due to the larger specific surface area and strong interface interaction of nanoparticles, which make them have a broader application prospects in the aerospace, automotive industry and other fields. However, the preparation of nano-particle reinforced aluminum matrix composite is more complex and difficult than the traditional aluminum composites due to the inherent physical and chemical properties of nanoparticles. The main difficulties of the preparation of nano-particle reinforced aluminum matrix composite lies in the uniform distribution of nanoparticle and the wetting bettwen the matrix and ceramic nanoparticle. Up to now, the technology is still less for the scaled-up preparation of bulk aluminum matrix nanocomposite.
In this dissertation, nano-Al2O3p/2024aluminum matrix composite was prepared by solid-liquid mixed casting process, which effectively solve the key problems associated with poor wettability between the nanoparticle reinforcement and the matrix melt, and nanoparticle clustering in the melt during the preparation of metal matrix nanocomposite. The solidified microstructure and particle re-distribution behavior of nano-Al2O3p/2024aluminum matrix composite melt processed by the high-intensity ultrasonic were investigated. The main deformation process performed on the nanocomposite was repeated upsetting and extrusion (RUE), and the microstructure evolution and tensile properties during the multi-pass upsetting and extrusion process were studied, and the refinement mechanism of the microstructure and the deformation mechanism of RUE process were indicated. The strengthening mechanism of as-RUE processed nano-Al2O3p/2024aluminum matrix composite was analyzed. The main conclusions were drawn as follows:
The flowing field of the fluid in the crucible during solid-liquid mixed process was simulated using finite element method (FEM). The effects of the stirrer geometry and some stirring process parameters on the flowing characteristics of the fluid were analyzed. The results showed that the stirrer geometry and processing parameters had significant effects on the flowing behavior of the fluid in the crucible. The multistage stirrer, lower blade angle and bigger diameter of the impeller were beneficial to reduce the mixing inefficient zone and "dead" zone in the crucible. Under the mixing action of multistage stirrer, a strong turbulence formed in the central region of the crucible. When the blade angle was30°, the turbulences generated by each impeller were like a "spiral" vortex. Increasing in the rotating speed, the flowing characteristics of the fluid in the crucible was gradually changing from "self-feeding" generated by each impeller to "the whole cycle", and the strong shear zone formed in the upper and lower regions of each impeller.
During the preparation of nano-Al2O3p/Al composite powders, with the extension of ball time, the distribution homogeneity of Al2O3nanoparticle on the surface of Al powder was obviously improved. With the increase of the content of Al2O3nanoparticle, the clustering tendency of Al2O3particles in the composite powder gradually increased. When the content of Al2O3nanoparticle was4wt.%, the as-received nanopowder of Al2O3particle was uniformly distributed on the surface of Al powder after the ball time of12h. During the solid-liquid mixed process, Al2O3nanoparticles were effectively incorporated into the matrix melt and well dispersed in the melt under the action of the Al powders carrier. Based on the microstructure analysis, a model about the dispersion of Al2O3nanoparticles in the melt during the solid-liquid mixed process was established.
When nano-Al2O3p/2024aluminum matrix composite melt prepared by the solid-liquid mixed process was processed by high-intensity ultrasonic, the solidified microstructure was obviously refined. The refinement efficiency was weaken on the too high or too low ultrasonic temperature. With the extension of ultrasonic time, the refinement efficiency gradually decreased. When the ultrasonic temperature was650～670℃, ultrasonic power was300W, and ultrasonic time was60s, the composite presented a fine uniform microstructure, which was composed of fine grains with an average size of25μm The Al2O3nanoparticles were pushed to grain boundary and final solidification regions in the normal casting condition. Under the condition of ultrasonic treatment, the transient cavitations could remove the gas layer from the nanoparticle surface, improving the wettability between nanoparticles and the matrix melt. Some Al2O3nanoparticulates were captured by the growing grain. As a result, the resulting distribution of Al2O3nanoparticles within the matrix was improved with the cooperation of ultrasound refinement of the microstructure.
Before the RUE deformation of nano-Al2O3p/2024aluminum matrix composite, the distribution characteristics and their evolution laws of flowing field, strain field, temperature field and stress field during RUE process were analyzed using FEM. And the releated experiments were carried out to further verify the simulation. The results indicated that the traditional RUE process easily led to the processing defects, such as the axile hole and the fold, and the strain distribution inside the material was very uneven. The processing defects were effectively avoided using the modified RUE, and the uniform region of equivalent strain inside the processed sample increased with the increase of the billet length. A bigger corner radius and smaller friction were helpful to improve the strain homogeneity inside the processed sample. The strong shear region formed in the each stage of modified RUE process. Flowing fields of modified RUE showed that the grid flow line on the surface of as-processed sample flowed backward due to the friction after the odd number pass, and after the even pass RUE deformation, the grid characteristics reverted to the initial state. With the increase of the odd and even deformation passes, the relevant flowing characteristics of the grid lines presented no significant change.
The microstructure evolution of nano-Al2O3p/2024aluminum matrix composite during modified RUE process was investigated by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results indicated that the matrix was effectively refined after modified RUE processing, and the grain refining efficiency decreased with the increase of RUE pass number. Lower deformation temperature and more deformation pass, the microstructure was more refine and homogeneous. After6pass RUE deformation at350℃, the average grain size of the matrix was5μm. The grain refining mechanisms of the matrix were consist of recrystallization refining mechanism and alternate shear refining mechanism. For the second phase, its refining mechanism was the mechanical cracking mechanism.
Room-temperature tensile test results showed that after T6heat treatment, the tensile strength of as-RUE processed nano-Al2O3p/2024aluminum matrix composite increased initially, reached a peak and there after decreased to attain a constant value with the increase of the RUE pass. The ultimate tensile strength (UTS) and yield strength (YS) of as-extruded nano-Al2O3p/2024aluminum matrix composite processed by T6heat treatment was485MPa,382MPa and8.5%, respectively. The UTS and YS of as-T6nano-Al2O3p/2024aluminum matrix composite processed after1RUE pass was492MPa and391MPa, respectively. The UTS and YS of as-T6nano-Al2O3p/2024aluminum matrix composite processed after4RUE pass was477MPa and375MPa, respectively. After that, the tensile property presented no significant change with the increase of RUE pass. With the increase of RUE pass, the elongation (δ) was obviously improved. After5RUE pass, the8increased from8.5%to13.5%. The improvement on the comprehensive tensile properties of as-processed nano-Al2O3p/2024aluminum matrix composite resulted from the combined action of grain refinement strengthening mechanism, the strengthening mechanism of the matrix precipitated phase and Al2O3nanoparticle.
引文
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