论文部分内容阅读
本文对 Mg—4.3Al—Zn—0.4Mn 合金在应变速率■=33.3×10~(-6)s~(-1)～1.67×10~(-1)s~(-1)范围内进行了拉伸试验;采用 Backofen 的速度突变法测定合金的应变速率敏感性指数 m,得到完整的 log■/Iog(?)和 m/log(?)曲线;借助于高放大倍率的二次复型组织,对目前公认的晶界滑动(GBS)、扩散蠕变(DC),位错滑移(DS)三种变形机制在 logσ/log■曲线的Ⅰ、Ⅱ、Ⅲ区内各自所占的比例进行了测定和计算,其结果是:Ⅰ区:rGBS=35% rDC=37.8% rDS=19.6%Ⅱ区:rGBS=58% rDC=28.5% rDS=12.3%Ⅲ区:rGBS=19% rDC=6.3% rDS=69%根据计算结果,文章就三种变形机制在变形过程中的相互作用和协调关系进行了讨论。
In this paper, the strain rate of Mg-4.3Al-Zn-0.4Mn alloy was measured in the range of 33.3 × 10 ~ (-6) s ~ (-1) ~ 1.67 × 10 ~ (-1) s ~ Tensile test was carried out. The strain rate sensitivity index m of the alloy was measured by Backofen velocity mutation method to obtain the complete log / / Iog ()) and m / log ()) curves. By means of high magnification secondary complex , The proportion of the currently accepted GBS, DC and DS deformations in each of the regions I, II and III of the logσ / log ■ curve The results are: Zone I: rGBS = 35% rDC = 37.8% rDS = 19.6% Zone II: rGBS = 58% rDC = 28.5% rDS = 12.3% rDS = 69% According to the calculation results, the article discusses the interaction and coordination of the three deformation mechanisms in the deformation process.