Developing Ultrafine Grain Sizes Using Severe Plastic Deformation
Developing Ultrafine Grain Sizes Using Severe Plastic Deformation
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DOI：
10.1002/1527-2648(200103)3:3
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发表时间：
2001-03
影响因子：
3.6
通讯作者：
M. Furukawa;Z. Horita;T. Langdon
中科院分区：
文献类型：
--
作者：
M. Furukawa;Z. Horita;T. Langdon
严重的塑性变形可以用作加工工具，以实现金属合金的晶粒尺寸与亚微米或纳米范围的细化。本文使用相等通道角压力（ECAP）的步骤描述了最新的发展，其中将样品按下包含通道弯曲到L形构型的模具。与通过模具的通过相关的剪切引入了亚晶带带，这些子晶体带有其他按压，将谷物阵列进化为谷物阵列，这些晶粒被具有高度不良的边界分离。 ECAP的过程是在环境温度下提高合金的强度和韧性的有用工具，并在升高温度下快速应变速率以快速应变速率地形成合金的潜力。
Severe plastic deformation may be used as a processing tool to achieve a refinement in grain size in metallic alloys to the submicrometer or nanometer range. This paper describes recent developments using the procedure of equal-channel angular pressing (ECAP) in which samples are pressed through a die containing a channel bent into an L-shaped configuration. The shearing associated with passage through the die introduces bands of subgrains which evolve, with additional pressings, into arrays of grains separated by boundaries having high angles of misorientation. The process of ECAP is a useful tool for both increasing the strength and toughness of an alloy at ambient temperatures and achieving a potential for superplastic forming of the alloy at rapid strain rates at elevated temperatures.