Strengthening of AA7075 alloy by processing with high-pressure sliding (HPS) and subsequent aging
Strengthening of AA7075 alloy by processing with high-pressure sliding (HPS) and subsequent aging
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DOI：
10.1016/j.msea.2015.01.026
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发表时间：
2015-03-25
期刊：
影响因子：
6.4
通讯作者：
Horita, Zenji
中科院分区：
文献类型：
--
作者：
Lee, Seungwon;Tazoe, Kiyonari;Horita, Zenji
高压滑动（HPS）是板材在高压作用下的一种新型剧烈塑性变形过程。在本研究中，采用HPS工艺对7075铝合金进行时效硬化晶粒细化。在1.0 GPa的压力下进行HPS，在室温下滑动距离为7.0 mm，在373 K和423 K下滑动距离为10 mm，因此平均晶粒尺寸减小到接近280 nm，接近240 nm和接近250 nm。通过晶粒细化，获得了接近600 MPa的极限抗拉强度。在373 K时效下，进一步硬化至745 MPa的极限抗拉强度，延伸率为4%，通过细小的析出相分散而断裂。结果表明，HPS时效处理可使AA7075同时实现晶粒细化和细析出强化。(C) 2015 Elsevier B.V.版权所有
High-pressure sliding (HPS) is a new severe plastic deformation process for sheet samples under high-pressure. In this study, the HPS process is applied to an age-hardenable 7075 aluminum alloy for grain refinement. HPS was conducted under a pressure of 1.0 GPa for sliding distances of 7.0 mm at room temperature and for 10 mm at 373 K and 423 K, and thus the average grain size was reduced to similar to 280 nm, similar to 240 nm and similar to 250 nm. Ultimate tensile strength of similar to 600 MPa was achieved by this grain refinement. Aging at 373 K led to further hardening to 745 MPa of ultimate tensile strength with 4% of elongation to fracture through a fine dispersion of precipitates. It is shown that simultaneous strengthening due to grain refinement and fine precipitation is achieved in the AA7075 by application of HPS and subsequent aging. (C) 2015 Elsevier B.V. All rights reserved.