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超塑性研究发展至今,正面临着三个主要技术难关的挑战:1)超塑性变形速度慢,大多数合金呈现超塑性的应变速度范围是10~(-4)—10~(-3)s~(-1);2)空洞问题,它涉及到超塑性成形件的机械性能;3)变形温度高(～0.5T_m),这牵涉到能耗及模具消耗.本文主要就第一个问题探索一下新的解决途径.现有超塑性理论认为提高合金的超塑性变形速度就必须更进一步地细化晶粒(∝1/d~2),而目前的超塑性预处理工艺,无论是形变热处理还是循环热处理工艺对合金晶粒的细化能力
The development of superplasticity research is facing three major technical challenges: 1) Superplastic deformation is slow, and most alloys exhibit superplasticity in the strain rate range of 10 -4 -10 -10 -3 s ~ (-1); 2) cavity problem, which involves the mechanical properties of superplastic forming parts; 3) high deformation temperature (~ 0.5T_m), which involves energy consumption and mold consumption.This paper mainly on the first question to explore The new solution is that existing superplasticity theory suggests that the grain (α1 / d ~ 2) must be further refined to increase the superplastic deformation rate of the alloy. However, the current superplasticity pretreatment process, Or cycle heat treatment of the alloy grain refinement capacity