Microstructure and mechanical properties of hierarchical multi-phase composites based on Al-Ni-type intermetallic compounds in the Al-Ni-Cu-Si alloy system

被引：42
作者：
Kim, J. T. [1 ,3 ]
Hong, S. H. [3 ]
Park, J. M. [4 ]
Eckert, J. [1 ,2 ]
Kim, K. B. [3 ]
机构：
[1] Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
[2] Univ Leoben, Dept Mat Phys, Jahnstr 12, A-8700 Leoben, Austria
[3] Sejong Univ, Dept Nanotechnol & Adv Mat Engn, 209 Neungdong Ro, Seoul 05006, South Korea
[4] Samsung Elect Co Ltd, GTC, 129 Samsung Ro, Suwonsi 443742, Gyeonggi Do, South Korea
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 749卷
基金：
新加坡国家研究基金会; 欧洲研究理事会;
关键词：
intermetallics; Metals and alloys; Mechanical properties; Atomic force microscopy; ULTRAFINE EUTECTIC COMPOSITE; DEFORMATION MECHANISMS; ENHANCED PLASTICITY; TITANIUM-ALLOYS; IN-SITU; EVOLUTION; BEHAVIOR;
D O I：
10.1016/j.jallcom.2018.03.313
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Systematic microstructural investigations of a series of Al81Ni13-xCuxSi6 alloys with x = 0, 3, 5, 8, and 10 at.% revealed that addition of Cu leads to a change of the primary intermetallic compound from Al3Ni to Al3Ni2. Moreover, Cu addition induces a multi-phase composite microstructure consisting of dual primary phases (Al3Ni2+ alpha-Al) and a eutectic matrix. The eutectic matrix is transformed from (alpha-Al+Si) eutectic to (alpha-Al+Al2Cu+Si) eutectic. In course of the microstructural evolution, the mechanical properties are enhanced, and the Al81Ni5Cu8Si6 alloy exhibits optimized room temperature mechanical properties such as an increased yield strength of similar to 600MPa and a remarkably improved fracture strain of similar to 15% due to similar lattice parameters and crystal structures of the constituent phases. The large macroscopic plastic strain is attributed to a combination of impeded crack growth and wavy propagation of shear bands in the intermetallic compounds. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：205 / 210
页数：6
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