变形量和变形速率对AM60铸锭压缩过程中孪晶的影响
Influence of Deformation Degree and Rate on Twins of Cast AM60 during Compression Test
摘 要
在电子万能试验机上对铸态AM60镁合金进行室温压缩试验,研究了在变形量分别为3.3%,10%,12%,20%,26%以及变形速率为0.2,0.5,2,5 mm/min时压缩变形组织中孪晶的形态.结果表明:在塑性变形初期,只有少量晶粒内出现孪晶,孪晶较宽;而在变形末期,孪晶几乎分布于所有晶粒中,且出现了细而长的孪晶.随着变形速率的增大,孪晶变细,并且孪晶的密度增大,试样的屈服强度、抗压强度都升高.
变形量
变形速率
孪晶
magnesium alloy
deformation degree
deformation rate
twin
Abstract
Deformation twinning of cast magnesium alloy AM60 was investigated by compression at room temperature with various deformation degrees from 3.3% to 24% and various deformation rates from 0.2 mm/min to 5 mm/min,respectively.Microstructure of the deformed samples examined by optical microscopy showed that thick twins exited in a few amount of crystals at the beginning of the deformation.The thin-long twins and the thick twins appeared at the end of the deformation,and they could be observed in almost all crystals.With increasing compressing rates,the yield strength,compressive resistance fracture strength and density of twins increased,and twins became thin.
中图分类号 TG146
所属栏目
基金项目 湖南省重点资助项目(03JKY1016);湖南省重大专项计划资助项目(04GK1008-1)
收稿日期 2005/7/18
修改稿日期 2005/9/23
网络出版日期
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备注夏伟军(1971-),男,湖南益阳人,博士研究生.
引用该论文: XIA Wei-jun,YANG Chun-hua,HUANG Chang-qing,CHEN Zhen-hua. Influence of Deformation Degree and Rate on Twins of Cast AM60 during Compression Test[J]. Materials for mechancial engineering, 2006, 30(8): 13～15
夏伟军,杨春花,黄长清,陈振华. 变形量和变形速率对AM60铸锭压缩过程中孪晶的影响[J]. 机械工程材料, 2006, 30(8): 13～15
被引情况:
【1】卢立伟,赵俊,刘龙飞,王亚平,陈志钢, "温度和加载方向对挤压态AZ31镁合金动态压缩行为及显微组织的影响",机械工程材料 38, 35-39(2014)
【2】刘龙飞,姜炳春,赵俊,卢立伟, "冲击载荷下AZ31镁合金的变形行为和组织演变",机械工程材料 39, 24-28(2015)
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参考文献
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【4】Máthis K,Chmelík F,Trojamová Z,et al.Investigation of some magnesium alloys by use of the acoustic emission technigue[J].Materials Science and Engineering,2004,387-389:331-335.
【5】Staroselsky A,Anand L.A constitutive model for hcp materials deforming by slip and twinning:application to magnesium alloy AZ31B[J].International Journal of Plasticity,2003,19:1843-1864.
【6】Bohlen J,Chmelic F.Orientation effects on acoustic emission during tensile deformation of hot rolled magnesium alloy AZ31[J].Journal of Alloys and Compounds,2004,378:207-213.
【7】刘子利,丁文江,袁广银,等.镁铝基耐热铸造镁合金的进展[J].机械工程材料,2001,25(11):1-4.
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【10】董文超,王朝晖,康永林,等.T61热处理和过热变形对AM60镁合金组织及力学性能的影响[J].汽车工业与材料,2004,(7):26-28.
【11】Prado M T,Valle J A,Contreras J W.Microsoructural evolution during large strain hot rolling of an AM60 Mg alloy[J].Scripta Mterialia,2004,50:661-665.
【12】Mark Denis Nave,Matthew Robert Barnett.Microstructures and textures of prue magnesium deformed in plane-strain compression[J].Scripta Materialia,2004,51:881-885.
【13】吕宜振.Mg-Al-Zn合金组织、性能、变形和断裂行为研究[D].上海:上海交通大学,2001.
【14】Barnett M R,Keshavara Z,Beer A G,et al.Influence of grain size on the compressive deformation of wrought Mg-3Al-1Zn[J].Acta Materialia,2004,52:5093-5103.
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