论文部分内容阅读
本文对工业镁合金MB3、MB8、MB21在较大晶粒条件下呈现超塑性的可能性进行了研究。测定了最佳超塑性规范及应交速率敏感性指数m值等。结果表明,三种工业镁合金晶粒平均直径在20微米左右,卡头速度为O.5毫米/分,温度为375℃(MB3)、400℃(MB8)、350℃(MB21)的条件下,具有一般超塑性合金的力学特性,并且发现,MB8合金在400℃时以0.5毫米/分和2毫米/分的卡头速度拉伸时出现两个延伸率峰值,MB3合金在较大均匀变形后发生脆性断裂。
In this paper, the possibility of the superplasticity of industrial magnesium alloy MB3, MB8, MB21 under the condition of larger grain is studied. Determination of the best superplastic specifications and should pay the rate sensitivity index m value. The results show that the average grain diameter of the three kinds of industrial magnesium alloy is about 20 microns, the chuck speed is 0.5 mm / min, the temperature is 375 ℃ (MB3), 400 ℃ (MB8) and 350 ℃ (MB21) With the mechanical properties of a typical superplastic alloy and found that two elongation peaks were observed for the MB8 alloy when stretched at 400 ° C at a chuck speed of 0.5 mm / min and 2 mm / min. The MB3 alloy showed a larger average deformation After brittle fracture.