Grain refinement in coarse-grained 7475 Al alloy during severe hot forging
Grain refinement in coarse-grained 7475 Al alloy during severe hot forging
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DOI：
10.1080/14786430412331325049
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发表时间：
2005-04
影响因子：
1.6
通讯作者：
O. Sitdikov;T. Sakai *;A. Goloborodko;H. Miura;R. Kaibyshev
中科院分区：
文献类型：
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作者：
O. Sitdikov;T. Sakai *;A. Goloborodko;H. Miura;R. Kaibyshev
在490°C和3 × 10−4 s−1应变速率的多向压缩条件下，研究了粗晶7475铝合金中发生的晶粒细化。综合流动曲线显示出显着的工作软化后，屈服和高应变下的一个明显的稳态塑性流动。结构变化的特点是在粗晶粒内部的变形或微剪切带的发展，其次是在高应变的新晶粒的均匀演化。新的晶粒被认为是通过一种连续的反应，通过晶粒破碎，这是类似于连续动态再结晶（cDRX）的发展。详细讨论了热多向变形过程中细晶的产生机理和控制晶粒细化的因素。
Grain refinement taking place in a coarse-grained 7475 Al alloy was studied in multidirectional compression at 490°C and at a strain rate of 3 × 10−4 s−1. The integrated flow curve displays significant work softening just after yielding and an apparent steady-state plastic flow at high strains. The structural changes are characterized by the development of deformation or microshear bands in coarse-grain interiors, followed by homogeneous evolution of new grains at high strains. The new grains are considered to be developed by a kind of continuous reaction through grain fragmentation that is similar to continuous dynamic recrystallization (cDRX). The mechanism of fine grain production and the factors controlling grain refinement during hot multidirectional deformation are discussed in detail.