The effect of Mg on the structure and properties of Type 319 aluminum casting alloys

被引：70

作者：

Hwang, J. Y. ^{[2
]}

Banerjee, R. ^{[2
]}

Doty, H. W. ^{[3
]}

Kaufman, M. J. ^{[1
]}

机构：

[1] Colorado Sch Mines, Dept Met & Mat Engn, Golden, CO 80401 USA

[2] Univ N Texas, Dept Mat Sci & Engn, Denton, TX 76203 USA

[3] Met Casting Technol, Gen Motors Powertrain Grp, Milford, NH 03055 USA

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 04期

关键词：

Aluminum alloys; Aging; Precipitation hardening; 3DAP; TEM; TRANSMISSION ELECTRON-MICROSCOPY; CRYSTAL-STRUCTURE; SI ALLOYS; MECHANICAL-PROPERTIES; PRECIPITATION; ADDITIONS; PHASE; STABILITY; SEQUENCE; BEHAVIOR;

D O I：

10.1016/j.actamat.2008.11.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The precipitation hardening behavior of it Type 319 aluminum alloy (Al-6.7 wt.% Si-3.75 wt.% Cu) with and without 0.45 wt.% Mg has been investigated. It is shown that both theta and Q phase exist in the as-cast samples and are dissolved during solution heat treatment. Subsequent artificial aging results in the precipitation of both the metastable theta' phase typical of aged alloy 319 and, in the case of the Mg-containing alloy, all additional and extremely small phase, which was identified as Q' based oil previous literature. Both types of precipitates have been characterized using transmission electron microscopy ITEM) and three-dimensional atom probe (3DAP) tomography. The Mg-containing alloy exhibits higher strength and lower ductility, presumably due to both solid solution strengthening and the presence of the line Q' phase. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1308 / 1317

页数：10

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