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
收藏
页码：35 / 45
页数：11
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