何杰军,吴鲁淑

• 1:贵州理工学院材料与冶金工程学院
• 2:重庆大学材料科学与工程学院
• 3:贵州理工学院机械工程学院

摘要(Abstract)：

研究了挤压态AZ31镁合金在压缩过程中的组织变化及其演变机制,探讨了孪生对加工硬化的影响。结果表明,当应变量小于4%时,孪晶含量随应变增大而增多;此后,随应变增加,孪晶含量反而逐渐减少,显微组织分析表明发生了退孪生现象。但织构分析表明,镁合金在压缩过程中并没有发生退孪生。孪晶长大与合并模型被用于解释组织分析显示的孪晶产生和消失现象。在挤压态镁合金的压缩过程中,孪晶的长大与合并导致基体几乎被消耗完毕,大部分基体转变成了孪晶组织,孪晶合并成片,以至于在显微组织观察中产生了孪生先产生后消失的假象。研究还表明,在孪生过程中镁合金的晶体取向发生86.3°的转变,使得镁合金从软取向变成了硬取向,这种取向的转变是镁合金压缩变形过程加工硬化的主要原因。

关键词(KeyWords)： 镁合金;孪生;织构;塑性变形

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51501045);; 贵州省自然科学基金(黔科合J字[2015]2067号);; 贵州理工学院高层次人才科研启动经费项目(XJGC20141102);; 黔科合人才团队(2015)4008号

作者(Author): 何杰军,吴鲁淑

DOI: 10.13289/j.issn.1009-6264.2017.01.008

参考文献(References)：

• [1]张丁非,张红菊,兰伟,等.高强镁合金的研究进展[J].材料热处理学报,2012,33(6):1-8.ZHANG Ding-fei,ZHANG Hong-ju,LAN Wei,et al.Research progress of high-strength magnesium alloys[J].Transactions of Materials and Heat Treatment,2012,33(6):1-8.
• [2]卢立伟,赵俊,刘龙飞,等.AZ31冷锻及再结晶退火对挤压态AZ31镁合金组织的影响[J].中国有色金属学报,2014,24(12):2969-2977.LU Li-wei,ZHAO Jun,LIU Long-fei,et al.Influence of cold forging and recrystallization annealing on microstructure of extruded AZ31 magnesium alloys[J].Transactions of Nonferrous Metals Society of China,2014,24(12):2969-2977.
• [3]朱利敏,李全安,张清,等.Mg-5Gd-3Sm-0.5Zr耐热镁合金热压缩变形行为[J].材料热处理学报,2016,37(2):31-35.ZHU Li-min,LI Quan-an,Zhang Qing,et al.Hot compression deformation behavior of Mg-5Gd-3Sm-0.5Zr heat-resistant magnesium alloy[J].Transactions of Materials and Heat Treatment,2016,37(2):31-35.
• [4]Lv C L,Liu T M,Liu D J,et al.Effect of heat treatment on tension-compression yield asymmetry of AZ80 magnesium alloy[J].Materials and Design,2012,33(1):529-533.
• [5]Sadeghi Shook A S,Pekguleryuz M.Yield asymmetry and fracture behavior of Mg-3%Al-1%Zn-(0-1)%Sr alloys extruded at elevated temperatures[J].Materials Science and Engineering A,2011,528(25):7529-7536.
• [6]Jain J,Poole W J,Sinclair C W,et al.Reducing the tension-compression yield asymmetry in a Mg-8Al-0.5Zn alloy via precipitation[J].Scripta Materialia,2010,62(5):301-304.
• [7]Singh A,Somekawa H,Mukai T.Compressive strength and yield asymmetry in extruded Mg-Zn-Ho alloys containing quasicrystal phase[J].Scripta Materialia,2007,56(11):935-938.
• [8]Sandlbes S,Zaefferer S,Schestakow I,et al.On the role of non-basal deformation mechanisms for the ductility of Mg and Mg-Y alloys[J].Acta Materialia,2011,59(2):429-439.
• [9]Beyerlein I J,ToméC N.A probabilistic twin nucleation model for HCP polycrystalline metals[J].Proceedings of the Royal Society A 2010,466(2):2517-2544.
• [10]Wang Y N,Huang J C.The role of twinning and untwinning in yielding behavior in hot-extruded Mg-Al-Zn alloy[J].Acta Materialia,2007,55(3):897-905.
• [11]Ando D,Koike J,Sutou Y.Relationship between deformation twinning and surface step formation in AZ31 magnesium alloys[J].Acta Materialia,2010,58(13):4316-4324.
• [12]Wang B S,Xin R L,Huang G J,et al.Strain rate and texture effects on microstructural characteristics of Mg-3Al-1Zn alloy during compression[J].2012,66(5):239-242.
• [13]He J J,Liu T M,Zhang Y,et al.Deformation behaviour of hot extruded Mg alloy AZ31 during compressive deformation[J].Materials Science and Technology,2013,29(2):177-183.
• [14]Liu P,Xin Y C,Liu Q.Plastic anisotropy and fracture behavior of AZ31 magnesium alloy[J].Transactions of Nonferrous Metals Society of China,2011,21:880-884.
• [15]丁雪征,刘天模,陈建,等.孪晶界对AZ31镁合金静态再结晶的影响[J].中国有色金属学报,2013,23(1):1-8.DING Xue-zheng,LIU Tian-mo,CHEN Jian,et al.Effect of twin boundary on static recrystallization of AZ31 magnesium alloy[J].Transactions of Nonferrous Metals Society of China,2013,23(1):1-8.
• [16]陈振华,夏伟军,严红革.变形镁合金[M].北京:化学工业出版社,2005:81-85.
• [17]Sarker D.Chen D L.Detwinning and strain hardening of an extruded magnesium alloy during compression[J].Scripta Materialia,2012,67(2):165-168.
• [18]Ma Q,Kadiri H E,Oppedal A L,et al.Twinning effects in a rod-textured AM30 Magnesium alloy[J].International Journal of Plasticity,2012,29(2):60-76.
• [19]Xin Y C,Wang M Y,Zeng Z,et al,et al.Strengthening and toughening of magnesium alloy by{10 12}extension twins[J].Scripta Materialia,2012,66(1):25-28.
• [20]Lou X Y,Li M,Boger R K,et al.Hardening evolution of AZ31B Mg sheet[J].International Journal of Plasticity,2007,23(1):44-86.
• [21]Lu K,Lu L,Suresh S.Strengthening materials by engineering coherent internal boundaries at the nanoscale[J].Science,2009,324(5925):349-352.
• [22]Rohatgi A,Vecchio K S,GrayⅢG T.The influence of stacking fault energy on the mechanical behavior of Cu and Cu-Al alloys:Deformation twinning,work hardening,and dynamic recovery[J].Metallurgical and Materials Transactions,2001,32(1):135-145.
• [23]Barnett M R.Influence of deformation conditions and texture on the high temperature flow stress of magnesium AZ31[J].Journal of Light Metals,2001,1(3):167-177.
• [24]Ding S X,Lee W T,Chang C P,et al.Improvement of strength of magnesium alloy processed by equal channel angular extrusion[J].Scripta Materialia,2009,59(9):1006-1009.
• [25]Li X,Yang P,Wang L N,et al.Orientational analysis of static recrystallization at compression twins in a magnesium alloy AZ31[J].Materials Science and Engineering A,2009,517(1/2):160-169.
• [26]Luo T J,Yang Y S,Tong W H,et al.Fatigue deformation characteristic of as-extruded AM30 magnesium alloy[J].Materials and Design,2010,31(3):1617-1621.
• [27]Wang J,Hirth J P,ToméC N.(10-12)twinning nucleation mechanisms in hexagonal-close-packed crystals[J].Acta Materialia,2009,57(18):5521-30.
• [28]Dudamell N V,Ulacia I,Gálvez F,et al.Twinning and grain subdivision during dynamic deformation of a Mg AZ31 sheet alloy at room temperature[J].Acta Materialia,2011,59(18):6949-6962.
• [29]Knezevic M,Levinson A,Harris R,et al.Deformation twinning in AZ31:Influence on strain hardening and texture evolution[J].Acta Materialia,2010,58(19):6230-6242.
• [30]Hong S,Park S H,Lee C S.Role of{10-12}twinning characteristics in the deformation behavior of a polycrystalline magnesium alloy[J].Acta Materialia,2010,58(18):5873-5885.

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