The thickness of defect bands in high-pressure die castings

被引：56

作者：

Otarawanna, S. ^{[1
]}

Gourlay, C. M. ^{[2
]}

Laukli, H. I. ^{[3
]}

Dahle, A. K. ^{[4
]}

机构：

[1] Univ Queensland, CAST CRC, Brisbane, Qld 4072, Australia

[2] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2AZ, England

[3] Hydro Aluminium, Res & Technol Dev, N-6601 Sunndalsora, Norway

[4] Univ Queensland, ARC CoE Design Light Met, Brisbane, Qld 4072, Australia

来源：

MATERIALS CHARACTERIZATION | 2009年 / 60卷 / 12期

基金：

澳大利亚研究理事会;

关键词：

High pressure die casting; Macrosegregation; Defect bands; Reynolds' dilatancy; Strain localization; EBSD; IN-SITU; SHEAR DEFORMATION; MG-AL; MICROSTRUCTURE; SOLIDIFICATION; FRAGMENTATION; AZ91;

D O I：

10.1016/j.matchar.2009.06.016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Defect bands following the casting contour are often observed in high-pressure die cast (HPDC) components. In this article, suitable methods for measuring the thickness (w) and grain size in the bands (d(sb)) in HPDCs have been developed. The w/d(sb) relationship of defect bands has been investigated in HPDC specimens from a range of alloys, casting geometries and band locations within castings. Samples include aluminum alloy, AlSi4MgMn and AlMg5Si2Mn, tensile test bars cast by cold-chamber (cc) HPDC and a magnesium alloy, AM50, hot-chamber (hc) HPDC steering-wheel component. The band thicknesses were measured to be in the range 7-18 mean grains wide. This is substantial evidence that defect bands form due to strain localization in partially solidified alloys during cc and hc HPDC. Additionally, within this range, the w/d(sb) ratio decreases with increasing distance from the casting center in a cross-section containing multiple bands. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：1432 / 1441

页数：10

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