Effects of Deformation Conditions on Plasticity of AZ31 Magnesium Alloy
摘 要
对AZ31镁合金进行了不同轧角的冷轧及退火处理以细化其晶粒尺寸,然后在不同变形条件下对AZ31镁合金进行拉伸试验,研究了应变速率、变形温度、晶粒尺寸等因素对镁合金塑性的影响,并探讨了其超塑性的变形机理.结果表明:随着变形温度的升高,合金的流变应力单调递减,伸长率增大;在150~300 ℃,合金的变形激活能为90 kJ·mol-1,变形机制是晶界扩散控制的位错蠕变机制;在300~350 ℃,变形激活能为123 kJ·mol-1,变形机制是晶格扩散控制的晶界滑移;此合金的塑性成形条件适合工业生产.
Abstract
AZ31 alloy was cold rolled under different rolling angles and subsequently annealed to refine the grain size.The effects of deformation conditions on the plasticity were investigated through tensile tests under different temperatures,strain rates and grain sizes.Meanwhile,superplastic deformation mechanism was investigated.The results show that the flow stresses were decreased and the elongations were increased with the temperature increase.In the temperature range of 150-300 ℃,the deformation activation energy was 90 kJ·mol-1,the deformation mechanism was dislocation creep controlled by grain boundary diffusion.In the temperature range of 300-350 ℃,the deformation activation energy was 123 kJ·mol-1,the deformation mechanism was grain boundary slip controlled by lattice diffusion.The plastic deformation conditions of the alloy were suitable for industrialized production.
中图分类号 TG146.2
所属栏目 试验研究
基金项目
收稿日期 2008/9/9
修改稿日期 2009/9/2
网络出版日期
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备注朱浩(1983-),男,江苏苏州人,硕士研究生.
引用该论文: ZHU Hao,ZHOU Qing. Effects of Deformation Conditions on Plasticity of AZ31 Magnesium Alloy[J]. Materials for mechancial engineering, 2009, 33(12): 39~42
朱浩,周清. 变形条件对AZ31镁合金塑性的影响[J]. 机械工程材料, 2009, 33(12): 39~42
被引情况:
【1】王哲,胡水平,江海涛,李成,曾明, "AZ31镁合金手机外壳冲压模具的设计与成形工艺",机械工程材料 36, 54-57(2012)
【2】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)
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参考文献
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【3】丁睿,蔡庆伍,魏松波.变形参数对AZ31镁合金变形抗力的影响[J].北京科技大学学报,2008,30(3):258-262.
【4】陈振华,刘俊伟,陈鼎,等.镁合金超塑性的变形机理、研究现状及发展趋势[J].中国有色金属学报,2008,18(2):193-202.
【5】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.
【6】常量,曾小勤,丁文江.不同轧制方法制得镁合金板材的组织和织构特点[J].轻合金加工技术,2007,35(4):4-9.
【7】李保成,王强,张治民.AZ80合金初始晶粒对其流变应力影响的研究[J].塑性工程学报,2008,15(1):88-91.
【8】吴立鸿,马全仓,张春香,等.AZ70镁合金的高温流动应力及本构模型[J].稀有金属材料与工程,2008,37(1):54-57.
【9】CHEN Y J,WANG Q D,ROVEN H J.Microstructure evolution in magnesium alloy AZ31 during cyclic extrusion compression[J].Journal of Alloy and Compounds,2008,462:192-200.
【10】RAJ R,ASHBY M F.On grain boundary sliding and diffusion creep[J].Metallurgical Transactions,1971,2(4):11-13.
【11】DELVALLE J A,PENALBA F,RUANO O A.Optimization of the microstrcture for improving superplastic forming in magnesium alloys[J].Materials Science and Engineering A,2007,467:165-171.
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