6061铝合金半固态坯料部分重熔过程中的组织演变
Microstructure Evolution of Semi-Solid 6061 Aluminium Alloy Billet during Partial Remelting
摘 要
采用近液相线半连续铸造技术制备了6061铝合金半固态坯料,在610 ℃下对其进行二次加热部分重熔;采用光学显微镜及图像分析仪分析了加热不同时间合金的显微组织及尺寸特征,研究了二次加热过程中的液相形成、组织演变及晶粒长大过程.结果表明:随着保温时间延长,在相变及扩散作用下,液相体积分数不断增加并达到平衡,蔷薇状非枝晶组织特征逐渐弱化,并向近球状组织演变;随着保温时间继续延长,晶粒长大且尺寸分布不均匀;保温480 s左右时晶粒圆整、尺寸分布均匀,适合触变成型.
6061铝合金
部分重熔
组织演变
semi-solid
6061 Al alloy
partial remelting
microstructure evolution
Abstract
The 6061 semi-solid aluminium alloy feedstock was prepared by nearby-liquidus semi-continuous casting technology.The feedstock was re-heated and partially remelted at 610 ℃.The microstructure and size characteristics of the alloy heated for different times were analyzed by optical microscopy and image analyzer.The liquid formation,microstructure evolution and growth of grains during holding time were observed and analyzed.It is found that the volume fraction of liquid phase increased first and reached equilibrium then with the prolongation of holding time due to the effects of phase transition and diffusion.The rosette-like non-dendritic structure characteristic was gradually weakened and the microstructure transformed to near-spherical structure.The grains grew and the size distributed heterogeneously with the increase of the holding time.The grains were round and the size distributed homogeneously after holding for 480 s,which was suitable for thixocasting.
中图分类号
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(50874049)
收稿日期 2009/2/24
修改稿日期 2010/1/4
网络出版日期
作者单位点击查看
备注尚淑珍(1972-),女,吉林临江人,讲师,博士.
引用该论文: SHANG Shu-zhen,LU Gui-min,ZHAO Zhu-xin. Microstructure Evolution of Semi-Solid 6061 Aluminium Alloy Billet during Partial Remelting[J]. Materials for mechancial engineering, 2010, 34(2): 1～3
尚淑珍,路贵民,赵祖欣. 6061铝合金半固态坯料部分重熔过程中的组织演变[J]. 机械工程材料, 2010, 34(2): 1～3
被引情况:
【1】薛寒松,彭开建,吴招兵,向军军,张丁非, "半固态搅拌对Mg-6Gd-3Y-0.4Zr-2Zn镁合金显微组织的影响",机械工程材料 38, 17-20(2014)
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参考文献
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【2】LOUE W R,SUERY M.Microstructural evolution during partial remelting of Al-Si7Mg alloys[J].Materials Science ＆ Engineering A,1995,203:1-13.
【3】XIA K,TAUSIG G.Liquidus casting of a wrought aluminum alloy 2618 for thixoforming[J].Materials Science ＆ Engineering A,1998,246:1-10.
【4】路贵民,董杰,崔建忠,等.液相线半连续铸造7075Al合金二次加热与触变成型[J].金属学报,2001,37(11):1184-1188.
【5】谢水生,潘洪平,丁志勇.半固态金属加工技术研究现状与应用[J].塑性工程学报,2002,9(2):1-11.
【6】ZOQUI E J,SHEHATA M T,PAES M,et al.Morphological evolution of SSM A356 during partial remelting[J].Materials Science ＆ Engineering A,2002,325:38-53.
【7】DONG J,CUI J Z,LE Q C,et al.Liquidus semi-continuous casting,reheating and thixoforming of a wroght aluminum alloy 7075[J].Materials Science ＆ Engineering A,2003,345:234-242.
【8】WANG H,DAVIDSON C J,STJOHN D H.Semisolid microstructural evolution of AlSi7Mg alloys during partial remelting[J].Materials Science ＆ Engineering A,2004,368:159-167.
【9】KLIAUGA A M,FERRANTE M.Liquid formation and microstructural evolution during re-heating and partial melting of an extruded A356 aluminium alloy[J].Acta Materialia,2005,53:345-356.
【10】路贵民,史立峰,王平,等.ZL201合金半固态二次加热时的组织演变[J].东北大学学报:自然科学版,2006,27(6):669-672.
【11】ZHA M,WANG H Y,XUE P F,et al.Microstructural evolution of Mg-5Si-1Al alloy during partial remelting[J].Journal of Alloys and Compounds,2009,472:18-22.
【12】LEE Sang-yong,OH Se-li.Thixoforming characteristics of thermo-mechanically treated AA 6061 alloy for suspension parts of electric vehicles[J].Journal of Materials Processing Technology,2002,130/131:587-593.
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