挤压轧制薄板过程中AZ31镁合金的组织演变
Microstructure Evolution of AZ31 Magnesium Alloy during Extrusion and Rolling Sheet
摘 要
对挤压轧制薄板过程中AZ31镁合金的显微组织和晶粒取向差的变化进行了试验研究.结果表明:AZ31镁合金铸锭经挤压后,中部和边部晶粒尺寸相差很大,小角度晶界较少,中部和边部的晶粒取向差分布出现较大区别,但没有孪晶出现;经轧制后,出现了孪晶,且随着变形量的增大,孪晶数量增加,小角度晶界增多,中部和边部晶粒尺寸差距逐渐减小;退火后,孪晶等变形组织消失,形成均匀细小的等轴晶,小角度晶界减少,中部和边部晶粒取向差都在30°附近.
薄板
挤压轧制
显微组织
AZ31 magnesium alloy
sheet
extrusion rolling
microstructure
Abstract
The microstructure and grain misorientation of the AZ31 magnesium alloy sheet during extrusion and rolling were investigated.The results show that the size and misorientation distribution of the middle and marginal grains of the extruded AZ31 magnesium alloy cast ingot had a great disparity.Small angle grain boundaries and no twin were found after extrusion.After rolling,both the twins and small angle grain boundaries were observed and increased with the increase of the reduction.The misorientation decreased gradually with the increase of the reduction.The deformed structure including twins disappeared after annealing and homogenous fine equiaxed grains were formed.Small angle boundaries reduced after annealing,and the grain misorientation distributed at nearly 30 degrees.
中图分类号 TG146.2
所属栏目 试验研究
基金项目 国家重点基础研究“973”发展计划资助项目(2007 CB613703);科技部中法镁合金国际合作重点项目(2006DFA51160)
收稿日期 2009/7/4
修改稿日期 2010/3/28
网络出版日期
作者单位点击查看
备注李秀莲(1968-),女,青海西宁人,副教授.
引用该论文: LI Xiu-lian,WANG Mao-yin,XIN Ren-long,HUANG Guang-jie,LIU Qing. Microstructure Evolution of AZ31 Magnesium Alloy during Extrusion and Rolling Sheet[J]. Materials for mechancial engineering, 2010, 34(8): 26～29
李秀莲,王茂银,辛仁龙,黄光杰,刘庆. 挤压轧制薄板过程中AZ31镁合金的组织演变[J]. 机械工程材料, 2010, 34(8): 26～29
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参考文献
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【3】杨平,任学平,赵祖德.AZ31镁合金热成形及退火过程的组织与织构[J].材料热处理学报,2003,24(4):12-16.
【4】WATANABLE H,TSUTSUI H.Deformation mechanisms in a coarse-grained Mg-Al-Zn alloy at elevated temperatures[J].Int J Plasticity,2001,17:387-397.
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【6】CAHN R W.非铁合金的结构与性能[M].丁道云,译.北京:科学出版社,1999.
【7】KIM H K,KIM W J.Microstructural instability and strength of an AZ31 Mg alloy after severe plastic deformation[J].Materials Science and Engineering A,2004,385:300-308.
【8】PEREZ-PRADOM T,VALLE J A,RUANO O A.Grain refinement of Mg-Al-Zn alloys via accumulative roll bonding[J].Scripta Materialia,2004,51:1093-1097.
【9】SUN H Q,SHI Y N,ZHANG M X,et al.Plastic strain-induced grain refinement in the nanometer scale in a Mg alloy[J].Acta Materialia,2007,55:975-982.
【10】VALLE J A,PEREZ-PRADO M T,RUANO O A.Deformation mechanisms responsible for the high ductility in a Mg AZ31 alloy analyzed by electron backscattered diffraction[J].Metallurgical and Materials Transactions A,2005,36:1427-1438.
【11】CHINO Y,LEE J S,SASSA K,et al.Press formability of a rolled AZ31 Mg alloy sheet with controlled texture[J].Materials Letters,2006,60:173-176.
【12】汪凌云,黄光杰,陈林,等.镁合金板材轧制工艺及组织性能分析[J].稀有金属材料与工程,2007,36(5):910-914.
【13】KOIKE J.Dislocation plasticity and complementary deformation mechanisms in polycrystalline Mg alloys[J].Material Science Forum,2004,449/452:665-668.
【14】PEREX-PRADO M T,VALLE J A,Ruano O A.Effect of sheet thickness on the microstructural evolution of an Mg AZ61 alloy during large strain hot rolling[J].Scripta Materialia,2004,50:667-671.
【15】田素贵,杨景红,于兴福,等.AZ31镁合金蠕变初期的变形特征[J].金属学报,2005,41(4):375-379.
【16】刘桂荣,王忠堂,郑文涛,等.AZ31镁合金热精轧及热处理工艺实验研究[J].沈阳理工大学学报,2007,26(6):66-69.
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