A STUDY OF FATIGUE CRACK-GROWTH IN A PARTICULATE-REINFORCED AL-SI ALLOY AT 23-DEGREES-C AND 220-DEGREES-C

被引：23

作者：

HEALY, JC ^{[1
]}

BEEVERS, CJ ^{[1
]}

机构：

[1] UNIV BIRMINGHAM,SCH MET & MAT,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1991年 / 142卷 / 02期

关键词：

D O I：

10.1016/0921-5093(91)90657-9

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A study of short- and long-fatigue-crack growth in A356, a cast Al-Si alloy, reinforced with 20% volume fraction of silicon carbide (SiC) particulate, was carried out at 23-degrees-C. Long-crack growth tests were performed at 220-degrees-C. Short-crack growth was observed below the long-crack threshold stress intensity at 23-degrees-C and was dominated by interactions between the crack tips and the SiC particulate. In the long-crack tests at R = 0.1 and R = 0.5 a stress ratio effect on crack growth was observed at 23-degrees-C, which was more marked than that observed at 220-degrees-C. Examination of fatigue fracture surfaces revealed a matrix-dominated mode of crack growth at 220-degrees-C compared with that at 23-degrees-C where the SiC particulate played a significant role in the fatigue fracture process.

引用

页码：183 / 192

页数：10

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