热处理对Mg-Sm-Zn-Zr合金组织、散热性能和力学性能的影响
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摘要
采用正交试验设计法研究了固溶时间、时效温度和时效时间三因素对Mg-5. 0Sm-0. 6Zn-0. 5Zr(质量分数,%)合金组织、散热性能和力学性能的影响及其显著性。结果表明,各因素对合金组织影响的主次顺序为固溶时间>时效温度>时效时间,对合金散热性能影响的主次顺序为时效时间>时效温度>固溶时间,对合金力学性能影响最显著的为时效温度,固溶时间和时效时间影响相对较弱。采用固溶温度520℃、固溶时间4 h,时效温度180℃、时效时间40 h的热处理工艺能使合金获得较好的散热性能。采用固溶温度520℃、固溶时间8h,时效温度200℃、时效时间10 h的热处理工艺能使合金获得较好的力学性能。而采用固溶温度520℃、固溶时间4 h,时效温度200℃、时效时间40 h时,合金可以获得较好的综合性能。
Based on the orthogonal design and analysis method,the effect of solution time,aging temperature and time on the microstructure,heat dissipation performance and mechanical properties of Mg-5. 0 Sm-0. 6 Zn-0. 5 Zr alloy( mass fraction,%) were investigated. Results showed that the order of influence factors on the microstructure of alloys was: solution time > aging temperature > aging time; the order of the influence factors on the heat dissipation performance was:aging time > aging temperature > solution time; the aging temperature was the most significant influence factor on the mechanical properties of alloys and the effect of solution time and aging time were relatively weak. Also,results demonstrated that the alloy obtained better heat dissipation performance after being solution treated at 520 ℃ for 4 h and aged at 180 ℃ for 40 h. The alloy obtained better mechanical properties after being solution treated at 520 ℃ for 8 h and aged at 200 ℃for 10 h. The alloy obtained better comprehensive performance after being solution treated at 520 ℃for 4 h and aged at 200 ℃ for 40 h.
Based on the orthogonal design and analysis method,the effect of solution time,aging temperature and time on the microstructure,heat dissipation performance and mechanical properties of Mg-5. 0 Sm-0. 6 Zn-0. 5 Zr alloy( mass fraction,%) were investigated. Results showed that the order of influence factors on the microstructure of alloys was: solution time > aging temperature > aging time; the order of the influence factors on the heat dissipation performance was:aging time > aging temperature > solution time; the aging temperature was the most significant influence factor on the mechanical properties of alloys and the effect of solution time and aging time were relatively weak. Also,results demonstrated that the alloy obtained better heat dissipation performance after being solution treated at 520 ℃ for 4 h and aged at 180 ℃ for 40 h. The alloy obtained better mechanical properties after being solution treated at 520 ℃ for 8 h and aged at 200 ℃for 10 h. The alloy obtained better comprehensive performance after being solution treated at 520 ℃for 4 h and aged at 200 ℃ for 40 h.
引文
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[2]辛明德,吉泽升.稀土元素在铸造镁合金中应用的研究现状及其发展趋势[J].中国稀土学报,2010,28(6):643-653.
[3]王勇,廖治东,张恒飞,等.稀土在镁合金中作用的研究现状[J].材料导报,2011,25(S1):487-491.
[4]张清,李全安,井晓天,等.稀土Sm在耐热镁合金中的应用[J].铸造,2010,59(3):260-262.
[5]朱蓓蓓,孙扬善,贾迪,等. Mg-Sm系合金的显微组织及力学性能[J].东南大学学报(自然科学版),2009,39(3):610-614.
[6]袁明,郑子樵. Mg-2.6Sm-1.3Gd-0. 6Zn-0. 5Zr镁合金显微组织和力学性能研究[J].稀有金属材料与工程,2014,43(11):2787-2791.
[7] YAMASAKI M,KAWAMURA Y. Thermal diffusivity and thermal conductivity of Mg-Zn-rare earth element alloys with long-period stacking ordered phase[J]. Scripta Materialia,2009,60(4):264-267.
[8]张捷宇,王继旭,吴广新.检测金属散热器件散热性能的方法及其测试装置:201410286343.9[P]. 2014-08-26.
[9]FU P H,PENG L M,JIANG H Y,et al. Zr-containing precipitates in Mg-3wt%Nd-0. 2wt%Zn-0. 4wt%Zr alloy during solution treatment at 540℃[J]. Materials Science Forum,2007,546-549:97-100.
[10]GILL L R,LORIMER G W,LYON P. The effect of zinc and gadolinium on the precipitation sequence and quench sensitivity of four Mg-Nd-Gd alloys[J]. Advanced Engineering Materials,2007,9(9):784-792.
[11]WEI L Y,DUNLOP G L,WESTENGEN H. Solidification behavior and phase constituents of cast Mg-Zn-misch metal alloys[J].Journal of Materials Science,1997,32(12):3335-3340.
[12]LORIMER G W,APPS P J,KARIMZADEH H,et al. Improving the performance of Mg-rare-earth alloys by the use of Gd or Dy additions[J]. Materials Science Forum,2003,419-422:279-284.
[13]谭真,郭广文.工程合金热物性[M].北京:冶金工业出版社,1994.