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

页码：254 / 258

页数：5

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