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

共 37 条

[31] In situ observations of dendritic fragmentation due to local solute-enrichment during directional solidification of an aluminum alloy [J].

Ruvalcaba, D. ;

Mathiesen, R. H. ;

Eskin, D. G. ;

Arnberg, L. ;

Katgerman, L. .

ACTA MATERIALIA, 2007, 55 (13) :4287-4292

[32]

SANNES S, 1998, INT C MAGNESIUM ALLO, P223

[33]

SANNES S, 2003, T J MAT MANUF, V112, P1

[34]

Wang H., 2000, Aluminum Transactions, V2, P57

[35] Thermal and flow modelling of ladling and injection in high pressure die casting process [J].

Wang, LH ;

Nguyen, T ;

Savage, G ;

Davidson, C .

INTERNATIONAL JOURNAL OF CAST METALS RESEARCH, 2003, 16 (04) :409-417

[36]

Wong RCK, 2000, GEOTECH TEST J, V23, P158

[37] In situ observation of nucleation, fragmentation and microstructure evolution in Sn-Bi and Al-Cu alloys [J].

Yasuda, H. ;

Yamamoto, Y. ;

Nakatsuka, N. ;

Nagira, T. ;

Yoshiya, M. ;

Sugiyama, A. ;

Ohnaka, I. ;

Umetani, K. ;

Uesugi, K. .

INTERNATIONAL JOURNAL OF CAST METALS RESEARCH, 2008, 21 (1-4) :125-128

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