Mg-Zn-Gd镁合金SSIMA法等温半固态组织演变

范俊凯; 杨光昱; 轩敏鑫; 刘少军; 介万奇

doi:10.15980/j.tzzz.2014.08.029

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Mg-Zn-Gd镁合金SSIMA法等温半固态组织演变
Semi-Solid Microstructural Evolution of Mg-Zn-Gd Magnesium Alloy by the SSIMA Process
2014年34卷第8期页码：816-820
纸质出版日期： 2014 ，
DOI： 10.15980/j.tzzz.2014.08.029

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[1]范俊凯,杨光昱,轩敏鑫,刘少军,介万奇.Mg-Zn-Gd镁合金SSIMA法等温半固态组织演变[J].特种铸造及有色合金,2014,34(08):816-820.

Fan Junkai, Yang Guangyu, Xuan Minxin, et al. Semi-Solid Microstructural Evolution of Mg-Zn-Gd Magnesium Alloy by the SSIMA Process[J]. Special Casting & Nonferrous Alloys, 2014,34(8):816-820.
[1]范俊凯,杨光昱,轩敏鑫,刘少军,介万奇.Mg-Zn-Gd镁合金SSIMA法等温半固态组织演变[J].特种铸造及有色合金,2014,34(08):816-820. DOI： 10.15980/j.tzzz.2014.08.029.

Fan Junkai, Yang Guangyu, Xuan Minxin, et al. Semi-Solid Microstructural Evolution of Mg-Zn-Gd Magnesium Alloy by the SSIMA Process[J]. Special Casting & Nonferrous Alloys, 2014,34(8):816-820. DOI： 10.15980/j.tzzz.2014.08.029.

摘要

研究了Mg-5.5Zn-2Gd-0.6Zr镁合金在不同挤压下的SSIMA法等温半固态组织演变过程和组织粗化行为。结果表明

在相同挤压比条件下

α-Mg平均晶粒直径与等温时间之间的关系为:等温处理后平均晶粒直径的三次方与初始平均晶粒直径的三次方的差值等于粗化速率常数与等温时间的乘积。粗化速率常数K随挤压比的增大而减小。当挤压比分别为10、15、30时

镁合金横向组织晶粒粗化速率常数K分别为359、289、266μm3/s。另外

挤压比越高

镁合金半固态组织等温转变各阶段的进程加快

α晶粒的圆整度和均匀程度越好。

Abstract

Semi-solid microstructural evolution of extruded Mg-5.5Zn-2Gd-0.6Zr magnesium alloy with different extrusion ratio by the SSIMA process was investigated.It is found that the relationship between the average diameter ofα-Mg grains and the isothermal holding time meets the difference between the cube of average grain diameter and initial average grain diameter equal to the coarstning constant K and the isothrmal time t under the condition of the same extrusion ratio.The coarsening rate constant K is decreased with the increase of the extrusion ratio

which reaches 359μm3/s

289μm3/s and 266μm3/s when the extrusion ratio is 10

15 and 30

respectively.It is also found that the semi-solid isothermal evolution process of the experimental alloy is accelerated with the increase of the extrusion ratio

meanwhile

the roundness and uniformity ofα-Mg grains also are improved.