Superplastic behavior of an Al-4wt.T% Ti alloy processed by the powder metallurgy route

G.S. Murty , M.J. Koczak
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引用次数: 31

Abstract

The superplastic behavior of an Al-4wt.% Ti alloy processed using rapid solidification powder metallurgy was investigated. The peak value of the strain rate sensitivity index increased with temperature and grain size. The drop in flow stress with increasing grain size and anomalously high activation energy for flow at low strain rates are explained in terms of a grain size and temperature dependent threshold stress for superplastic flow. The origin of the threshold process is interpreted to be the inhibition of grain boundary migration by the particles during superplastic flow. An increase in the activation energy for flow was observed at temperatures close to the melting point of aluminum.

Al-4wt的超塑性行为。采用粉末冶金方法加工的T% Ti合金
Al-4wt的超塑性行为。对快速凝固粉末冶金法制备% Ti合金进行了研究。应变速率敏感性指数的峰值随温度和晶粒尺寸的增大而增大。流动应力随晶粒尺寸的增大而下降,在低应变速率下流动活化能异常高,这可以用晶粒尺寸和温度相关的超塑性流动阈值应力来解释。阈值过程的起源被解释为在超塑性流动中抑制颗粒的晶界迁移。在接近铝熔点的温度下观察到流动活化能的增加。
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