Intermetallic phase evolution and strengthening effect in Al-Mg2Si alloys with different Cu/Ni ratios

被引：30
作者：
Sun, Yilin [1 ]
Li, Chong [1 ]
Liu, Yongchang [1 ]
Yu, Liming [1 ]
Li, Huijun [2 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300350, Peoples R China
[2] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia
来源：
MATERIALS LETTERS | 2018年 / 215卷
基金：
中国国家自然科学基金;
关键词：
Metals and alloys; Casting; Intermetallic phases; Microstructure; Mechanical properties; IN-SITU; MECHANICAL-PROPERTIES; MICROSTRUCTURAL EVOLUTION; HYPEREUTECTIC AL-MG2SI; NANOCRYSTALLINE MG2SI; TENSILE PROPERTIES; NI; CU; BEHAVIOR; HARDNESS;
D O I：
10.1016/j.matlet.2017.12.067
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Microalloying of an Al-15%Mg2Si alloy (wt%) with Ni and Cu produced an enhanced strengthening response, increasing hardness whilst also improving tensile strength due to the formation and evolution of intermetallic phases. With the increase of Cu/Ni ratios, intermetallic phases translate from Al3Ni or Al3CuNi to Al7Cu4Ni, and the total volume fraction of Al3CuNi and Al7Cu4Ni increases to 3.51% (1% Ni and 5% Cu, Cu/Ni ratio = 5). The thermally stable Al3CuNi and Al7Cu4Ni phases are connected to each other forming chains and tend to build up a network. As a result, the ultimate tensile strength (at 350 degrees C) of the alloy (Cu/Ni ratio = 5) reached up to 132 MPa, 131.6% higher than that of Al-15%Mg2Si alloy. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：254 / 258
页数：5
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