EFFECT OF HEAT TREATMENT ON NANOSTRUCTURING IN HIGH-STRENGTH ALUMINUM ALLOY BY SEVERE PLASTIC DEFORMATION

被引：0

作者：

Sitdikov, O. ^{[1
]}

Krymskiy, S. ^{[1
]}

Markushev, M. ^{[1
]}

Avtokratova, E. ^{[1
]}

Sakai, T. ^{[2
]}

机构：

[1] Inst Met Superplast Problems RAS, Ufa, Russia

[2] UEC Tokyo Univ Electrocommun, Chofu, Tokyo 1828585, Japan

来源：

REVIEWS ON ADVANCED MATERIALS SCIENCE | 2012年 / 31卷 / 01期

关键词：

2ND PHASE PARTICLES; GRAIN-REFINEMENT; MECHANICAL-PROPERTIES; MICROSTRUCTURES; TEMPERATURE;

D O I：

暂无

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Effect of prior heat treatment on nanostructuring of high-strength 7475 Al alloy, subjected to high-pressure torsion (HPT) at ambient temperature up to strain of similar to 7, was investigated. The alloy was (i) solution treated and water quenched, and then (ii) artificially aged before HPT. In distinction with the state (i), the state (ii) was characterized by the presence of nanoprecipitates of strengthening eta' - phase in Al matrix. It was shown that the initial alloy state significantly affected the morphology and parameters of nanocrystalline structures evolved. Mixed (sub)grain/cellular structure composed by both equiaxed and elongated crystallites, predominantly separated by dislocation boundaries, was developed in the aged state, whereas more equiaxed and coarse crystalline structure with more equilibrium boundaries formed in the asquenched material. It was concluded that high density precipitates in the alloy can delay the formation of nanograins in the deformation structures due to inhibition of dynamic recovery and homogenization of the dislocation slip.

引用

页码：62 / 67

页数：6

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