Dynamic response and microstructure control of Al-Sc binary alloy under high-speed impact

被引：31

作者：

Zhang, W. G. ^{[1
]}

Ye, Y. C. ^{[2
]}

He, L. J. ^{[3
]}

Li, P. J. ^{[1
]}

Feng, X. ^{[3
]}

Novikov, L. S. ^{[4
]}

机构：

[1] Tsinghua Univ, Natl Ctr Novel Mat Int Res, Beijing 100084, Peoples R China

[2] Natl Univ Def Technol, Coll Aerosp & Mat Engn, Changsha 410073, Hunan, Peoples R China

[3] Tsinghua Univ, Sch Aerosp, Beijing 100084, Peoples R China

[4] Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119992, Russia

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 578卷

关键词：

High-speed impact; Al3Sc precipitation; Grain refinement; Al-Sc alloy; Microstructure control; DISCONTINUOUS PRECIPITATION; SCANDIUM; EVOLUTION; CRATERS; AL3SC;

D O I：

10.1016/j.msea.2013.04.067

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

It is concluded that the secondary Al3Sc particles play a predominant role on the high-speed impact process. The secondary Al3Sc particles have two effects of stabilizing the matrix structure and acting as source of dislocation. Because the capability of Al-Sc alloy to resist high-speed projectile impact is related to the microstructure, the development of Al-Sc alloy with a combination of fine-grain strengthening and precipitation strengthening is investigated. The results show that Sc additions greater than the eutectic composition (0.55 wt%) were found to produce a remarkable refinement in the grain size. Discontinuous precipitations, which are undesired, are prone to occur in the hypereutectic Al-Sc alloys. For the hypereutectic Al-Sc alloys, control of the aging temperature within a certain range can suppress the presence of discontinuous precipitation, thus the Al-Sc alloy can be strengthened by both the fine-grain strengthening and by continuous precipitation strengthening, which helps to improve the capability to resist high-speed impact. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：35 / 45

页数：11

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