冷轧预变形量对1460合金组织和性能的影响

Effect of different cold rolling reduction on the microstruture and mechanical properties of the 1460 alloy

摘要:

本文研究了时效前不同冷轧预变形量（ε=7%，14%，20%，27%）对1460合金沉淀强化过程的影响。当冷轧变形量增加至20%时，合金中出现位错墙（Dense Dislocation Wall）。位错为T1相提供了形核位置，使得合金中T1相的数量增加同时尺寸保持在100 nm 左右，缩短了时效峰值时间。27%冷轧变形+160 ℃/12 h时效能提高合金的强度，同时塑性较好，此时合金的抗拉强度和延伸率分别为590 MPa和8%。

Abstract:

The effects of different cold rolling reduction ratio(ε=7%，14%，20%，27%) prior to aging on pricipitation hardening of the 1460 alloy have been studied. Some dense dislocation walls (DDW) have developed in the Al matrix in the ε= 20% sample.The matrix dislocations provide nucleation sites for the T1 phase, thus the pricipitation of the T1 is enhanced and its size remians about 100 nm, furthermore the samples reach the peak strength in a shorter time. The preferable process is 27% cold rolling reduction + 160 ℃/12 h. The results show that the tensile strength and elongation of the samples could be increased to 590 MPa and 8.0%.