Solid solution strengthening in polycrystals of Mg–Sn binary alloys

▶ The 0.2% proof strength for the polycrystals of Mg–Sn binary alloys increases linearly with c n at room temperature, where c is the solute Sn atom concentration and n = 1/2 and 2/3. ▶ It is suggested that the strengthening of basal planes controls the solid solution strengthening effect in polycry...

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Bibliographic Details
Published in:Journal of alloys and compounds 2011-02, Vol.509 (7), p.3357-3362
Main Authors: Shi, B.Q., Chen, R.S., Ke, W.
Format: Article
Language:English
Subjects:
Alloys
Binary alloys
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Hardness
Magnesium base alloys
Materials science
Mg–Sn alloys
Physics
Polycrystals
Softening
Softening effect
Solid solution strengthening
Solid solution, precipitation, and dispersion hardening
aging
Solid solutions
Solution strengthening
Strengthening
Treatment of materials and its effects on microstructure and properties
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Summary:▶ The 0.2% proof strength for the polycrystals of Mg–Sn binary alloys increases linearly with c n at room temperature, where c is the solute Sn atom concentration and n = 1/2 and 2/3. ▶ It is suggested that the strengthening of basal planes controls the solid solution strengthening effect in polycrystals of Mg–Sn binary alloys. ▶ The c n power-law is not applicable in the temperature range 423–623 K, which is explained by the occurrence of the softening effect. Solid solution effects on the hardness and flow stress in Mg–Sn binary alloys with Sn content between 0.18% and 2.18% at temperatures ranging from ambient to 623 K were investigated in this study. At room temperature, the hardness increases with the Sn content as H v0.5 = 28.3 + 6.88 c, the 0.2% proof strength (corrected for grain size strengthening effect) and c n follow a linear relationship, where c is the solute atom fraction and n = 1/2 or 2/3. The results suggest that the strengthening of basal planes controls the solid solution strengthening in polycrystals of Mg–Sn binary alloys. However, the c n power-law is not applicable in the temperature range from 423 K to 623 K, which is proposed to be ascribed to the competition between solid solution strengthening and softening effect.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2010.12.065