XRD的TA10钛合金热压缩变形后位错演化分析
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摘要
为了分析TA10钛合金位错演化,对TA10钛合金做了热模拟压缩实验,并对压缩后的试样进行了X射线衍射(XRD)实验。根据不同晶面的衍射峰,结合Dunn公式计算出了各晶面的位错密度。结果表明:TA10钛合金的软化机制在相变点以下以动态再结晶为主,相变点以上以动态回复为主;位错类型主要是柱面(1010),基面(0002)和锥面(1011)型位错; 800℃~900℃时,基面的位错密度变化最为显著,随着变形温度的升高,基面受动态再结晶的影响最大;应变速率增大及变形温度降低时总位错密度变大。随着变形量的增大,相变点以下,总位错密度先增大后减小,1 000℃时,总位错密度波动不大。使用XRD法可方便定量分析TA10钛合金热压缩变形后位错密度的演变规律。
Hot compression tests of TA10 titanium alloy are conducted to analyze the dislocation evolution of this type of alloy,and X-ray diffraction experiment is conducted on the samples after compression. According to the diffraction peaks of different crystal faces,the dislocation density of each crystal face is calculated in combination with the Dunn formula. Results show that the main softening mechanism of the TA10 titanium alloy is dynamic recrystallization below the phase transformation point,which turns into dynamic recovery above the phase transformation point. The primary dislocations consist of column plane( 1010), basal plane( 0002),and conical plane( 1011) for deformed TA10 titanium alloy. At 800 ℃ ~ 900 ℃,the dislocation density of the basal plane changes most prominently,and the dynamic recrystallization has the strongest influence on the base surface dislocation when the temperature increases. The total dislocation density grows with the increase of strain rate and decrease of deformation temperature. With the increase of deformation,the total dislocation density rises first and then diminishes below the phase transformation point but is nearly unchanged at 1 000 ℃ with the increase of deformation degree. The XRD method can be used to quantitatively analyze the evolution of dislocation density after hot compression deformation of TA10 titanium alloy.
Hot compression tests of TA10 titanium alloy are conducted to analyze the dislocation evolution of this type of alloy,and X-ray diffraction experiment is conducted on the samples after compression. According to the diffraction peaks of different crystal faces,the dislocation density of each crystal face is calculated in combination with the Dunn formula. Results show that the main softening mechanism of the TA10 titanium alloy is dynamic recrystallization below the phase transformation point,which turns into dynamic recovery above the phase transformation point. The primary dislocations consist of column plane( 1010), basal plane( 0002),and conical plane( 1011) for deformed TA10 titanium alloy. At 800 ℃ ~ 900 ℃,the dislocation density of the basal plane changes most prominently,and the dynamic recrystallization has the strongest influence on the base surface dislocation when the temperature increases. The total dislocation density grows with the increase of strain rate and decrease of deformation temperature. With the increase of deformation,the total dislocation density rises first and then diminishes below the phase transformation point but is nearly unchanged at 1 000 ℃ with the increase of deformation degree. The XRD method can be used to quantitatively analyze the evolution of dislocation density after hot compression deformation of TA10 titanium alloy.
引文
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[15]GAY P,HIRSCH P B,KELLY A. The estimation of dislocation densities in metals from X-ray data[J]. Acta metallurgica,1953,1(3):315-319.
[2]张朝晖,张永超,刘全明.氢对TA10合金焊接接头组织和性能的影响[J].兵器材料科学与工程,2018,41(3):1-4.ZHANG Zhaohui, ZHANG Yongchao, LIU Quanming.Effect of hydrogen content on microstructure and properties of TA10 alloy welded joint[J]. Ordnance material science and engineering,2018,41(3):1-4.
[3]史亚鸣,黄海广,李志敏,等.带钢热连轧机生产TA10钛合金带的轧制工艺[J].中国冶金,2017,27(8):41-44.SHI Yaming,HUANG Haiguang,LI Zhimin,et al. Rolling technique of TA10 titanium alloy strips produced by hot continuous rolling mill for steel strips[J]. China metallurgy,2017,27(8):41-44.
[4]苏娟华,邵鹏,任凤章. TA10钛合金的高温拉伸断裂极限[J].金属热处理,2018,43(4):24-28.SU Juanhua,SHAO Peng,REN Fengzhang. Tensile fracture limit of TA10 titanium alloy at high temperature[J].Heat treatment of metals,2018,43(4):24-28.
[5]石德珂.材料科学基础[M]. 2版.北京:机械工业出版社,2003:97-98.
[6]丁永根,孙建辉,李萍,等. TA15钛合金热压缩变形位错演化分析[J].稀有金属与硬质合金,2017,45(1):58-62,66.DING Yonggen,SUN Jianhui,LI Ping,et al. Dislocation evolution analysis of TA15 titanium alloy during hot compression deformation[J]. Rare metals and cemented carbides,2017,45(1):58-62,66.
[7]丁雨田,刘博,郭廷彪,等.等通道转角挤压过程中纯铜位错密度变化和力学性能[J].中国有色金属学报,2014,24(8):2057-2064.DING Yutian,LIU Bo,GUO Tingbiao,et al. Dislocation density variation and mechanical properties of pure copper via equal channel angular pressing[J]. The Chinese journal of nonferrous metals,2014,24(8):2057-2064.
[8]贾仁需,张玉明,张义门,等. XRD法计算4H-SiC外延单晶中的位错密度[J].光谱学与光谱分析,2010,30(7):1995-1997.JIA Renxu,ZHANG Yuming,ZHANG Yimen,et al. Calculation of dislocation destiny using X-Ray diffraction for4H-SiC homoepitaxial layers[J]. Spectroscopy and spectral analysis,2010,30(7):1995-1997.
[9]王晓强,崔凤奎,燕根鹏,等. 40Cr冷滚打成形中位错密度变化研究[J].中国机械工程,2013,24(16):2248-2252,2256.WANG Xiaoqiang,CUI Fengkui,YAN Genpeng,et al.Study on dislocation density change during cold roll-beating of 40Cr[J]. China mechanical engineering,2013,24(16):2248-2252,2256.
[10]周强. TC4钛合金板材电致塑性成形特性的实验研究[D].上海:上海交通大学,2015:44-45.ZHOU Qiang. Experimental research on the electricallyassisited forming properties of TC4 titanium alloy[D].Shanghai:Shanghai Jiao Tong University,2015:44-45.
[11]苏娟华,邵鹏,任凤章.锻造温度对TA10钛合金组织和性能的影响[J].材料热处理学报,2017,38(4):60-65.SU Juanhua,SHAO Peng, REN Fengzhang. Effect of forging temperature on microstructure and mechanical properties of TA10 titanium alloy[J]. Transactions of materials and heat treatment,2017,38(4):60-65.
[12]程帅朋,苏娟华,陈学文,等.锻造工艺对TA10钛合金组织性能的影响[J].河南科技大学学报(自然科学版),2017,38(3):6-9.CHENG Shuaipeng,SU Juanhua,CHEN Xuewen,et al.Effect of forging technology on microstructure and properties of TA10 titanium alloy[J]. Journal of Henan University of Science and Technology(natural science),2017,38(3):6-9.
[13]程帅朋,苏娟华,任凤章.锻后热处理温度对TA10钛合金组织及性能的影响[J].金属热处理,2016,41(10):158-161.CHENG Shuaipeng,SU Juanhua,REN Fengzhang. Effect of heat treatment temperature after forging on microstructure and properties of TA10 titanium alloy[J]. Heat treatment of metals,2016,41(10):158-161.
[14]王淑艳,岳旭,段晓辉,等.加工工艺对TA10大规格棒材力学性能的影响[J].世界有色金属,2016(5):43-45.WANG Shuyan,YUE Xu,DUAN Xiaohui,et al. Effect of processing method on mechanical properties of TA10large-section bars[J]. World nonferrous metals,2016(5):43-45.
[15]GAY P,HIRSCH P B,KELLY A. The estimation of dislocation densities in metals from X-ray data[J]. Acta metallurgica,1953,1(3):315-319.
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