STATISTICAL DISTRIBUTIONS OF FRACTURE STRENGTHS OF CAST AL-7SI-MG ALLOY

被引：138

作者：

GREEN, NR ^{[1
]}

CAMPBELL, J ^{[1
]}

机构：

[1] UNIV BIRMINGHAM,IRC MAT HIGH PERFORMANCE APPLICAT,BIRMINGHAM B15 2TT,ENGLAND

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1993年 / 173卷 / 1-2期

关键词：

D O I：

10.1016/0921-5093(93)90226-5

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Al-7Si-Mg alloy vertically cast test bars were produced in dry sand moulds by top filling (TF), turbulent bottom filling (TBF) and turbulence-free bottom filling (TFBF) with filtered metal. The test bars were heat treated prior to tensile testing. Scanning electron microscopy examination of polished sections showed that all the test bars contained tangled networks of oxide films which are seen to constitute cracks within the metal. They are more prevalent in the TF and TBF castings. A large number of anomalous features are observed on all fracture surfaces. These are oxide films produced during filling and entrained in the casting. The best description of the skewed distributions of tensile strengths of each set of castings was obtained with the Weibull distribution. Weibull slopes of 11, 20 and 38 were obtained for the TF, TBF and TFBF castings respectively.

引用

页码：261 / 266

页数：6