Phase formation in as-solidified and heat-treated Al-Si-Cu-Mg-Ni alloys: Thermodynamic assessment and experimental investigation for alloy design

被引：128

作者：

Farkoosh, A. R. ^{[1
]}

Javidani, M. ^{[2
]}

Hoseini, M. ^{[1
]}

Larouche, D. ^{[2
]}

Pekguleryuz, M. ^{[1
]}

机构：

[1] McGill Univ, Dept Min & Mat Engn, Aluminum Res Ctr REGAL, Montreal, PQ H3A 2B2, Canada

[2] Univ Laval, Dept Min Met & Mat Engn, Aluminum Res Ctr REGAL, Quebec City, PQ G1V 0A6, Canada

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2013年 / 551卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Al-Si casting alloys; Thermodynamic calculations; Nickel intermetallic precipitates; Aluminum engine alloys; MECHANICAL-PROPERTIES; INTERMETALLIC PHASES; BEHAVIOR; SILICON; MICROSTRUCTURE; STRENGTH; COPPER; MN;

D O I：

10.1016/j.jallcom.2012.10.182

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：

Thermodynamic simulations based on the CALPHAD method have been carried out to assess the phase formation in Al-7Si-(0-1)Ni-0.5Cu-0.35Mg alloys (in wt.%) under equilibrium and non-equilibrium (Scheil cooling) conditions. Calculations showed that the T-Al9FeNi, gamma-Al7Cu4Ni, delta-Al3CuNi and epsilon-Al3Ni phases are formed at different Ni levels. By analyzing the calculated isothermal sections of the phase diagrams it was revealed that the Ni:Cu and Ni:Fe ratios control precipitation in this alloy system. In order to verify the simulation results, microstructural investigations in as-cast, solution treated and aged conditions were carried out using electron probe microanalysis (EPMA), scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). Furthermore, cooling curve analysis (CCA) was also performed to determine the freezing range of the new alloys and porosity formation during solidification. Hardness measurements of the overaged samples showed that in this alloy system the delta-Al3CuNi phase has a greater influence on the overall strength of the alloys compared to the other Ni-bearing precipitates. (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：596 / 606

页数：11

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