Microstructure and mechanical properties at elevated temperature of Mg-AI-Ni alloys prepared through powder metallurgy

Mg-AI-Ni alloys were prepared by powder metallurgy, and their microstructure and elevated temper-ature mechanical properties were investigated. Results indicate that, in addition to α-Mg matrix, bothcoarse AI3Ni2 particles and fine AINi nano-particles exist in the Mg-AI-Ni alloys. The strength at 15...

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Bibliographic Details
Published in:材料科学技术学报：英文版 2017, Vol.33 (9), p.947-953
Main Author: Legan Hou Bingcheng Li Ruizhi Wu Lin Cui Peng Ji Ruiying Long Jinghua Zhang Xinlin Li Anping Dong Baode Sun
Format: Article
Language:English
Subjects:
AI3Ni2
AINi
alloy
metallurgy
Mg-AI-Ni
Powder
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Summary:Mg-AI-Ni alloys were prepared by powder metallurgy, and their microstructure and elevated temper-ature mechanical properties were investigated. Results indicate that, in addition to α-Mg matrix, bothcoarse AI3Ni2 particles and fine AINi nano-particles exist in the Mg-AI-Ni alloys. The strength at 150℃ is improved with the increase in Ni content. Mg-18.3AI-8Ni alloy possesses a compressive strength of234.7 MPa and a yield strength of 146.5 MPa. Plasticity is also improved with a low concentration ofNi. Mg-11.3AI-2Ni alloy possesses a compression ratio of 17.3g. The phases of AI3 Ni2 and AINi in thealloys block the movements of grain boundaries and dislocations during the deformation at elevatedtemperature. The existence of AINi phase provides a non-basal slip system, leading to the improve-ment in plasticity. Finally, the formation mechanism of AI-Ni phases in the process is discussed withthermodynamics and kinetics.
ISSN:1005-0302
1941-1162