Mg-10Gd-3Y-0.5Zr合金热压缩动态析出规律
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摘要
本文定量地研究了Mg-10Gd-3Y-0.5Zr(GW103K)合金在350℃~450℃及10~(-4)s~(-1)~10~(-1)s~(-1)热压缩条件下的动态析出规律。结果表明:固溶处理后的合金在450℃下压缩时,晶内和晶界均无析出相产生,在350℃~400℃热压缩时,有大量不规则颗粒状的析出相产生;析出相主要是β相,平均成分为Mg5.5(Gd_(0.73)Y_(0.27)),大部分分布于再结晶小晶粒的晶界处;析出相的尺寸随温度升高和应变速率的降低而增大,400℃、10~(-4)s~(-1)变形条件下的析出相尺寸能达到1μm以上,而350℃、10~(-4)s~(-1)变形条件下的析出相尺寸在100nm左右;析出相的体积分数随应变量呈非线性增加。不同的变形条件下,析出相体积分数增长趋势不同。350℃下的析出相体积分数在应变量为1.10时达到了3.5%。热压缩过程中,动态析出阻碍位错运动,抑制再结晶晶粒长大,对细化再结晶晶粒起到重要作用。
Dynamic precipitation behaviors were investigated in Mg-10Gd-3Y-0.5Zr alloys during compression at temperature range of 350-450℃ and strain rate range of 10-4-10~(-4)s~(-1).It was found that there were massive irregular precipitates formed in the alloys when the deformation temperature is lower than 400℃.The precipitates were identified asβphase with an average composition of Mg5.5(Gd_(0.73)Y_(0.27)).Most precipitates were found forming along recrystallized grain boundaries.The size of the precipitates was increased with deformation temperature and decreased with strain rate.The volume fraction of the precipitates was increased nonlinearly with deformation strain while the increasing tendency was dependent on deformation temperature and strain rate.Dislocation slipping and recrystallized grain growth were probably inhibited effectively by dynamic precipitates during hot deformation.
Dynamic precipitation behaviors were investigated in Mg-10Gd-3Y-0.5Zr alloys during compression at temperature range of 350-450℃ and strain rate range of 10-4-10~(-4)s~(-1).It was found that there were massive irregular precipitates formed in the alloys when the deformation temperature is lower than 400℃.The precipitates were identified asβphase with an average composition of Mg5.5(Gd_(0.73)Y_(0.27)).Most precipitates were found forming along recrystallized grain boundaries.The size of the precipitates was increased with deformation temperature and decreased with strain rate.The volume fraction of the precipitates was increased nonlinearly with deformation strain while the increasing tendency was dependent on deformation temperature and strain rate.Dislocation slipping and recrystallized grain growth were probably inhibited effectively by dynamic precipitates during hot deformation.
引文
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[4]何柏林,张志军.镁合金晶粒细化研究进展[J].兵器材料科学与工程,2015,38(05):116~120.
[5]陈勇军,王渠东,李德江,等.往复挤压工艺制备超细晶材料的研究与发展[J].材料科学与工程学报,2006,24(01):152~155.
[6]Hou X L,Cao Z Y,Sun X,et al.Twinning and dynamic precipitation upon hot compression of Mg-Gd-Y-Nd-Zr alloy[J].Journal of Alloys and Compounds,2012,525(2012):103~109.
[7]Kabir A S H,Sanjari M,Su J,et al.Effect of strain-induced precipitation on DRX in Mg-Al-Sn alloys[J].Materials Science and Engineering A,2014,616:252~259
[8]Li T,Du Z W,Zhang K,et al.Morphology and crystallography ofβprecipitate phase in Mg-Gd-Y-Nd-Zr alloy[J].Transactions of Nonferrous Metals Society of China,2012,22(12):2877~2882.
[9]Zeng X Q,Zou H H,Zhai C Q,et al.Research on dynamic precipitation behavior of pre-solution treated Mg-5wt.%Zn-2wt.%Al(-2wt.%Y)alloy during creep[J].Materials Science and Engineering A,2006,424(1~2):40~46.
[10]张春香,王利国,吴立鸿,等.主要耐热镁合金系的研究进展[J].材料科学与工程学报,2008,26(04):657~660.
[11]张新明,周楠,李理,等.Mg-8Gd-3Y-0.6Zr合金热压缩过程的动态再结晶[J].中国有色金属学报,2009,19(12):2067~2073.
[12]Li D J,Wang Q D,Blandin J J,et al.High temperature compressive deformation behavior of an extruded Mg-8Gd-3Y-0.5Zr(wt.%)alloy[J].Materials Science and Engineering A,2009,526(2009):150~155.
[13]何上明.Mg-Gd-Y-Zr(-Ca)合金的微观组织演变、性能和断裂行为研究[D].上海交通大学博士学位,丁文江,上海,上海交通大学材料科学与工程学院,2007年7月.
[14]Li L,Zhang X M,Deng Y L,et al.Superplasticity and microstructure in Mg-Gd-Y-Zr rolled sheet[J].Journal of Alloys and Compounds,2009,485(1~2):295~299.
[15]郑伟文,李兴刚,张奎,等.Mg-xGd-Zr合金均匀化处理过程中方块相的显微结构[J].中国有色金属学报,2015,(05):1136~1141.
[16]刘志杰,吴国华,刘文才,等.固溶处理对Mg-4Y-2Nd-1Gd-0.4Zr镁合金组织和性能的影响[J].材料热处理学报,2013,(03):60~66.
[17]Guo Y,Li J,Li J,et al.Mg-Gd-Y system phase diagram calculation and experimental clarification[J].Journal of Alloys and Compounds,2008,450(1~2):446~451.