16Mn/Zn复合材料界面组织结构与拉伸变形行为
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摘要
采用拉伸试验、金相显微镜、扫描电子显微镜对复合铸造法制备的16Mn/Zn复合材料界面层组织和性能进行了研究。研究结果表明:16Mn/Zn复合材料的强度介于锌和16Mn钢之间;受纵向拉伸的条件下,16Mn/Zn复合材料中的微裂纹首先在靠近钢一侧的界面层处萌生,并随载荷增加,微裂纹逐向锌基体扩展,与外加应力相垂直的主裂纹联接成大裂纹,最终导致锌断裂,之后应力由16Mn钢单独承载直至断裂;16Mn/Zn复合材料的纵向拉伸断口分为韧性断裂(16Mn钢)和脆性断裂(界面和锌)。
Mechanical properties and interfacial microstructure of 16Mn/Zn composite were investigated by means of tensile test,SEM and optical microscope.Results show that stress-strain curve of the 16Mn/Zn composite under tension lies between the stress-strain curves of 16Mn steel and zinc at room temperature.The micro-crack initiation occurred at 16Mn steel side of the interface of 16Mn steel and zinc in 16Mn/Zn composite under axial tension is observed.The cracks propagates towards zinc in the direction normal to the loading with increasing loading.At the same time,micro-crack initiation and propagation in zinc occurs,and the micro-cracks connect with each other to form main-cracks and then the growth of main-cracks causes zinc rapture.After that 16Mn steel in the composite supports load to rapture.The fracture of dimples in 16Mn steel and cleavage characteristics in zinc is observed for the 16Mn steel/Zn composite.
Mechanical properties and interfacial microstructure of 16Mn/Zn composite were investigated by means of tensile test,SEM and optical microscope.Results show that stress-strain curve of the 16Mn/Zn composite under tension lies between the stress-strain curves of 16Mn steel and zinc at room temperature.The micro-crack initiation occurred at 16Mn steel side of the interface of 16Mn steel and zinc in 16Mn/Zn composite under axial tension is observed.The cracks propagates towards zinc in the direction normal to the loading with increasing loading.At the same time,micro-crack initiation and propagation in zinc occurs,and the micro-cracks connect with each other to form main-cracks and then the growth of main-cracks causes zinc rapture.After that 16Mn steel in the composite supports load to rapture.The fracture of dimples in 16Mn steel and cleavage characteristics in zinc is observed for the 16Mn steel/Zn composite.
引文
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[2]Schaller R.Mechanical spectroscopy of interface stress relaxation in metal-matrix composites[J].Materials Science and Engineering A,2006,442(1-2):423-428.
[3]Aghdam M M,Falahatgar S R.Micromechanical modeling of interface damage of metal matrix composites subjected to transverse loading[J].CompositeStructures,2004,66(1-4):415-420.
[4]包晓军,刘勇兵,曹占义,等.抗震复合材料的单向拉伸与循环变形行为[J].材料科学与工艺,2005,13(5):163-166.BAO Xiao-jun,LIU Yong-bing,CAO Zhan-yi,et al.Uniaxial tension and cyclic deformation behavior of 16Mn/Zn laminated aseismic composites[J].Material Science and Technology,2005,13(5):163-166.
[5]Takeuchi E,Zene M.Novel continuous casting progress for clad steel slabs with level magnetic field[J].Iron Making and Steel Making,1997,24(3):257-263.
[6]Haga T,Nishiyama T,Suzuki S.Strip casting of A5182 alloy using melt drag twin7roll caster[J].Journal of Materials Processing Technology,2003,133:103-107.
[7]Xuping Su,Nai-Yong Tang,Jim M Toguri.Thermodynamic evaluation of the Fe-Zn system[J].Journal of Alloys and Compounds,2001,(325):129-136.
[8]Kubaschewski O,Massalski T,editors.Binary Alloy Phase Diagrams[M].Metals Park,OH:ASM,1986,1128.
[9]包晓军,刘勇兵,冉旭,等.双金属抗震减灾复合材料设计与抗震特性分析[J].地震工程与工程振动,2005,26(1):78-82.BAO Xiao-jun,LIU Yong-bing,RAN Xu,et al.Design of double-metal earthquake-resistant composite and analysis of its capability[J].EarthquakeEngineering and Engineering Vibration,2005,26(1):78-82.
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