Influence of Ce addition and homogenization temperature on microstructural evolution and mechanical properties of extruded Mg-Sn-Al-Zn alloy
Influence of Ce addition and homogenization temperature on microstructural evolution and mechanical properties of extruded Mg-Sn-Al-Zn alloy
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DOI：
10.1016/j.msea.2016.08.093
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发表时间：
2016-10-31
期刊：
影响因子：
6.4
通讯作者：
Park, Sung Hyuk
中科院分区：
文献类型：
--
作者：
Kim, Sang-Hoon;Park, Sung Hyuk
研究了Ce加入量和均匀化温度对挤压镁7Sn1Al 1Zn(TAZ711)合金组织和拉伸性能的影响。结果表明，Ce的加入使Ce3Sn5形成了热稳定的板条状Ce3Sn5相，而HT值的降低使未溶解的球状Mg2Sn相残留在均质坯中。随着Ce3Sn5和Mg2Sn2粒子数量的增加，挤压过程中动态形成的细小的镁锡析出物的数量逐渐减少，这是由于溶解在基体中的锡量减少，从而削弱了晶界钉扎效应，从而导致动态再结晶晶粒尺寸的增加。挤压后合金的抗拉强度随Ce加入量的增加和高温下温度的降低而降低，这主要是由于析出相数量的减少和晶粒度的增大所致。合金的屈服强度和极限抗拉强度与铸坯中Ce3Sn5和Mg2Sn颗粒的面积分数成反比，而合金的应变硬化能力与面积分数成正比。(C)2016爱思唯尔B.V.保留所有权利。
The effects of Ce addition and homogenization temperature (HT) on the microstructure and tensile properties of extruded Mg-7Sn-1Al-1Zn (TAZ711) alloy were investigated. It was found that Ce addition resulted in the formation of a thermally stable lath-type Ce3Sn5 phase and that a decrease in HT caused an undissolved spherical Mg2Sn phase to remain in the homogenized billets. With an increase in the amount of the Ce3Sn5 and Mg2Sn particles, the number of fine Mg2Sn precipitates formed dynamically during extrusion decreased gradually owing to a reduction in the amount of Sn dissolved in the matrix, which, in turn, led to an increase in the size of dynamically recrystallized grains because of a weakened grain boundary pinning effect. The tensile strength of the extruded alloys decreased with increasing amount of added Ce and decreasing HT, mainly because of the reduced number of precipitates and enlarged grain size. The yield strength and ultimate tensile strength of the alloy were inversely proportional to the area fraction of the Ce3Sn5 and Mg2Sn particles present in the homogenized billets, whereas the strain-hardening ability of the alloy was directly proportional to the area fraction. (C) 2016 Elsevier B.V. All rights reserved.