FATIGUE CRACK INITIATION AND MICROCRACK GROWTH IN 2024-T4 AND 2124-T4 ALUMINUM-ALLOYS

被引：120

作者：

KUNG, CY ^{[1
]}

FINE, ME ^{[1
]}

机构：

[1] NORTHWESTERN UNIV,EVANSTON,IL 60201

来源：

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1979年 / 10卷 / 05期

关键词：

D O I：

10.1007/BF02658324

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A metallograph was mounted directly on a closed-loop electrohydraulic testing unit and initiation of fatigue cracks was directly observed on polished notches at magnifications up to 800 times in aluminum alloys 2024 and 2124 in the T-4 condition. The latter is a high purity version of 2024 and contains considerably fewer constituent particles. At high stresses on the notch surface the fatigue cracks initiated on coarse slip lines in both alloys. At low stresses almost all of the cracks in 2024 initiated in the matrix adjacent to constituent particles. In 2124 at low stresses 50 pct of the cracks initiated near constituent particles and 50 pct in the matrix not near constituent particles. The probability that a constituent particle in 2024 initiates a fatigue crack falls off very rapidly as the particle size decreases below 6 μm. Growth of microcracks is impeded by grain boundaries. © 1979 American Society for Metals and the Metallurgical Society of AIME.

引用

页码：603 / 610

页数：8

共 25 条

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