等通道转角挤压对镁锆阻尼合金组织和性能的影响
Effect of ECAP on Microstructure and Properties of Mg-Zr Damping Alloy
摘 要
对铸态Mg-0.6%Zr合金进行了等通道转角挤压(ECAP)变形,采用光学显微镜观察了变形后合金的显微组织,并对不同温度、不同道次变形后的合金进行了显微硬度、抗拉强度及阻尼性能测定.结果表明:合金经过ECAP变形后,发生了动态再结晶,晶粒显著细化,但随挤压温度的升高发生晶粒长大;显微硬度随挤压道次的增加而增大,抗拉强度在300℃挤压6道次时达到最大值187.80 MPa;合金经400℃挤压1道次后的阻尼性能优于铸态合金的,其他条件下均低于铸态合金的.
镁锆合金
力学性能
阻尼性能
equal channel angular pressing (ECAP)
Mg-Zr alloy
mechanical property
damping capacity
Abstract
The microstructure of as-casted Mg-0.6 wt %Zr alloy deformed by equal channel angular pressing (ECAP) was observed by means of optical microscopy.The microhardness,tensile strength and damping properties of the alloy deformed at different temperatures and different rolling passes were tested.The results show that dynamic recystallization was found in the alloy after ECAP,and the grains were refined significantly.With the increase of rolling temperature,the grains grew.The microhardness increased with increasing the extrusion times.The maximal tensile strength value was 187.80 MPa,which was obtained at 300℃ with 6 extrusion times.The damping properties of the alloy were all worse than those of the as-casted alloy except for the one pressed at 400℃ with 1 extrusion time.
中图分类号 TG146
所属栏目 试验研究
基金项目
收稿日期 2008/12/17
修改稿日期 2009/10/16
网络出版日期
作者单位点击查看
备注沈平(1983-),男,山东莱州人,硕士研究生.
引用该论文: SHEN Ping,LIU Zi-li,SUN Ying-di. Effect of ECAP on Microstructure and Properties of Mg-Zr Damping Alloy[J]. Materials for mechancial engineering, 2010, 34(8): 5～8
沈平,刘子利,孙颖迪. 等通道转角挤压对镁锆阻尼合金组织和性能的影响[J]. 机械工程材料, 2010, 34(8): 5～8
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参考文献
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【5】黄姝珂,李宁,胥永刚,等.CuZnAl形状记忆合金等通道转角挤压工艺的研究[J].机械工程材料,2006,30(2):22-24.
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【7】张佳,刘楚明,王荣,等.退火时间对Mg-0.6Zr热轧板材阻尼性能的影响[J].材料科学与工程学报,2006,24(6):916-919.
【8】GRANATO A,LCKE K.Theory of mechanical damping due to dislocations[J].Journal of Applied Physics,1956,27(6):583-593.
【9】GRANATO A,LCKE K.Application of dislocation theory to internal friction phenomena at high frequencies[J].Journal of Applied Physics,1956,27(7):789-805.
【10】张兵,袁守谦,张西峰,等.累积复合轧制工艺晶粒细化机制对1060工业纯铝组织和性能的影响[J].北京科技大学学报,2008,30(12):1378-1382.
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【12】SCHOECK G,BISOGNI E,SHYNE J.The activation energy of high temperature internal friction[J].Acta Metallurgica,1964,12(12):1466-1468.
【13】ZHANG J,EEREZ R J,WONG C R,et al.Effects of secondary phases on the damping behavior of metals,alloys and metal matrix composites[J].Material Science Engineering,1994,13(8):325-390.
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