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首页> 外文会议>Symposium on Structure and Mechanical Properties of Nanophase Materials- Theory and Computer Simulation vs. Experiment Nov 28-30, 2000, Boston, Massachusetts, U.S.A. >Achieving Superplasticity and Superplastic Forming through Severe Plastic Deformation
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Achieving Superplasticity and Superplastic Forming through Severe Plastic Deformation

机译：通过严重的塑性变形实现超塑性和超塑性成形

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摘要

The application of severe plastic deformation to metals provides a convenient procedure for achieving nanometer and submicrorneter microstructures. Several different processing methods are available but Equal-Channel Angular Pressing (ECAP) is especially attractive because it provides an opportunity for preparing relatively large bulk samples. This paper describes the use of ECAP in preparing materials with ultrafine grain sizes and the subsequent properties of these materials at elevated temperatures. It is demonstrated that, provided precipitates are present to retain these small grain sizes at the high temperatures where diffusion is reasonably rapid, it is possible to achieve remarkably high superplastic elongations in the as-pressed materials and there is a potential for making use of this processing procedure to develop a superplastic forming capability at very rapid strain rates.
机译：对金属施加严重的塑性变形为实现纳米和亚微米级微结构提供了便利的程序。可以使用几种不同的处理方法，但是等通道角挤压（ECAP）尤其吸引人，因为它提供了制备相对较大体积样品的机会。本文介绍了ECAP在制备具有超细晶粒尺寸的材料中的用途以及这些材料在高温下的后续性能。已经证明，只要存在沉淀物以在扩散相当迅速的高温下保持这些小晶粒尺寸，就有可能在所压制的材料中获得非常高的超塑性伸长率，并且有可能利用这种沉淀物。加工程序以非常快的应变速率发展超塑性成形能力。

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