کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
828698 | 1470328 | 2015 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effect of icosahedral phase on the thermal stability and ageing response of a duplex structured Mg–Li alloy Effect of icosahedral phase on the thermal stability and ageing response of a duplex structured Mg–Li alloy](/preview/png/828698.png)
• I-phase formation improves the thermal stability of the β-Li phase.
• Suppression of Li diffusion by I-phase causes age-hardening response of the α-Mg matrix.
• Age-softening response of the β-Li phase is due to the Li diffusion.
The formation of I-phase (Mg3Zn6Y, icosahedral structure) can suppress the lithium diffusion from β-Li (Mg solid solution in Li) to α-Mg (Li solid solution in Mg) and then remarkably improve the thermal stability of β-Li. Although the lithium diffusion is suppressed by I-phase pockets, quick precipitation and growth of MgLiZn particles can lead to the age-softening response of β-Li. However, a normal age-hardening response of α-Mg can be maintained. Thus, the macro hardness of the Mg–6%Li–6%Zn–1.2%Y alloy depends on the competition between the age-softening of β-Li and age-hardening of α-Mg.
Journal: Materials & Design - Volume 69, 15 March 2015, Pages 124–129