稀土对Al-Zn-Mg合金力学性能和应力腐蚀的影响

Effects of Rare Earth on Mechanical Properties and Stress Corrosion Behavior of Al-Zn-Mg Alloy

XU Yue¹, LI Xue-bing²， YU Wen-xue³, ZHAO Zhu-d i³, LIU Yan-hua³, ZHANG Jian-qiao³

1. Analysis and Test Center, Jilin University, Changchun 130023, China;2. College of Physics, Jilin University, Changchun 130023, China；3. College of Materials Science and Engineering, Jilin University, Changchun 130023, China

Received:2003-05-02 Revised:1900-01-01 Online:2003-10-26 Published:2003-10-26
Contact: ZHAO Zhu-d i

Abstract

Abstract: The effects of small addition of rare earth (RE) on mechanical properties and stress corrosion behavior of Al-Zn-Mg alloy have been investigated. The results show that the addition of RE causes a shift of the peak hardness to shorter aging time and significantly increases the hardness, yield strength, tensile strength, elongation as well as stress corrosion cracking (SCC) resistance in the peak hardness of alloys aged at 150 ℃. Optical microscopy observation and X-ray diffraction showed that RE decreases grain sizes and expedite the precipitation of strengthing phase(MgZn₂). In addition, the a ddition of RE decreases markedly hydrogen content in the alloy.

Key words: Al-Zn-Mg alloy, rare earth, mechanical property and stress corrosion

CLC Number:

TG155.23

XU Yue, LI Xue-bing， YU Wen-xue, ZHAO Zhu-d i, LIU Yan-hua, ZHANG Jian-qiao. Effects of Rare Earth on Mechanical Properties and Stress Corrosion Behavior of Al-Zn-Mg Alloy[J].J4, 2003, 41(04): 506-509.

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Effects of Rare Earth on Mechanical Properties and Stress Corrosion Behavior of Al-Zn-Mg Alloy

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