EFFECT OF DIFFERENT AGING MICROSTRUCTURES ON THE FRACTURE TOUGHNESS OF HIGH STRENGTH Al-Zn-Mg-Cu ALLOYS.

被引：0
|
作者：
Kato, Eiji [1 ]
Ueda, Yoshisada [1 ]
Kobayashi, Toshiro [1 ]
机构：
[1] Nagoya Univ, Faculty of Engineering,, Nagoya, Jpn, Nagoya Univ, Faculty of Engineering, Nagoya, Jpn
来源：
Keikinzoku/Journal of Japan Institute of Light Metals | 1985年 / 35卷 / 12期
关键词：
ALUMINUM METALLOGRAPHY - Microstructures - FRACTURE MECHANICS;
D O I：
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中图分类号：
学科分类号：
摘要：
Tensile, impact, fracture mechanics and dynamic tear tests were carried out on 7075, 7175 and 7475 alloy extrusions. Fracture toughness of Al-Zn-Mg-Cu alloys is influenced by aging conditions. Under-aging results in high fracture toughness and resistance to crack propagation and unstable fracture. The fracture toughness decreases with increasing yield strength due to localized plastic deformation from precipitate particles and the resulting strengthened matrix. Over-aged materials have lower fracture toughness.
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页码：689 / 695
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