First-principles study of phase stability and solubility in Al-(Cu, Zr) alloys
First-principles study of phase stability and solubility in Al-(Cu, Zr) alloys
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Al-(Cu, Zr)合金相稳定性和溶解度的第一性原理研究
DOI:
10.1080/00150193.2018.1392130
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发表时间:
2018-01
期刊:
影响因子:
0.8
通讯作者:
姚兆凤
中科院分区:
文献类型:
--
作者:
陈树明;王海燕;任慧平;高雪云;姚兆凤
ABSTRACT The solubility limit of elements plays a crucial role in alloy designing, as well as in the understanding of kinetic processes in alloys. Using first-principles calculations, we calculated the ground states of Al-Cu and Al-Zr compounds, and predicted the stable and metastable structures of these two binaries. The results indicate that the stable structures for Al-Cu compounds are Al2Cu(cF12), AlCu(mC20), Al4Cu9(cP52) and AlCu3(tI8), and those for Al-Zr binary are Al3Zr(tI16), Al2Zr(hP12), Al3Zr4(hP7) and AlZr3(cP4). Based on the statistical-thermodynamic theory of dilute lattice gas, we presented a systematic series of calculations of the solubility limits of Cu and Zr in Al as a function of temperature. It is found that the solubility of Cu is much higher than Zr over the whole investigated temperature range.
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