Effect of Mg and Sr-modification on the mechanical properties of 319-type aluminum cast alloys subjected to artificial aging

被引：79

作者：

Tavitas-Medrano, F. J. ^{[2
]}

Gruzleski, J. E. ^{[2
]}

Samuel, F. H. ^{[1
]}

Valtierra, S. ^{[3
]}

Doty, H. W. ^{[4
]}

机构：

[1] Univ Quebec, Dept Appl Sci, Chicoutimi, PQ G7H 2B1, Canada

[2] McGill Univ, Dept Min Met & Mat Engn, Montreal, PQ H3A 2B2, Canada

[3] Corp Nemak, SA CV Res & Dev, Garza Garcia 66221, NL, Mexico

[4] Met Casting Technol Inc, GM Powertrain Grp, Milford, NH 03055 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 480卷 / 1-2期

基金：

加拿大自然科学与工程研究理事会;

关键词：

319-type alloys; Sr-modification; Mg addition; artificial aging treatments; mechanical properties;

D O I：

10.1016/j.msea.2007.09.002

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Aluminum-based 319-type cast alloys are commonly used in the automotive industry to manufacture cylinder heads and engine blocks. These applications require good mechanical properties and in order to achieve them through precipitation hardening, artificial aging treatments are applied to the products. The standard artificial aging treatment for alloy 319, as defined by the T6 heat treatment temper, consists in solution heat-treating the product for 8 h at 495 degrees C, water quenching at 60 degrees C, and then artificially aging at 155 degrees C for 2-5 h. The present paper reports on aging heat treatments that were performed on four Al-Si-Cu-Mg 319-type alloys: 319 base alloy, Sr-modified 319 alloy, 319 alloy containing 0.4 wt% Mg, and the Sr-modified 319 + 0.4 wt% Mg alloy. This investigation was carried out in order to examine the effect of Sr-modification and additions of Mg on the microhardness, tensile strength and impact properties of 319-type alloys over a range of aging temperatures and times (150-240 degrees C, for periods of 2-8 h). The results show that the best combination of properties is found in the Sr-modified alloy containing 0.4 wt% Mg (i.e. alloy 319 + Mg + Sr). Also, the optimum artificial aging temperature changes when Mg is present in the alloy. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：356 / 364

页数：9

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