Intermetallic phase formation and evolution during homogenization and solution in Al-Zn-Mg-Cu alloys

LI ChunMei 已出版文章查询
LI ChunMei
1 2 * CHEN ZhiQian 已出版文章查询
CHEN ZhiQian
3 ZENG SuMin 已出版文章查询
1 2 CHENG NanPu 已出版文章查询
3 CHEN TianXiao 已出版文章查询
CHEN TianXiao

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1School of Materials Science and Engineering Central South University Changsha 410083 China

2 School of Materials Science and Engineering Southwest University Chongqing 400715 China

3School of Materials Science and Engineering Southwest University Chongqing 400715 China

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The effects of major alloy element contents of Zn, Mg, Cu in Al-Zn-Mg-Cu alloys on the formation and evolution of intermetallic phases during casting, homogenization and solution treatment have been investigated through using X-ray diffraction, scanning electron microscopy and differential scanning calorimetry. Experimental results showed that a relatively higher Zn content with lower Mg and Cu contents was beneficial to the formation of MgZn2 phase instead of the Al2CuMg phase, which resulted in the unicity of the intermetallics in the Al matrix, and that the MgZn2 phase was easier for diffusion and dissolution during homogenization and solution than the Al2CuMg phase. Additionally, the results of the first-principles calculations gave support for explaining the experimental phenomena. A larger absolute value of formation enthalpy and a smaller value of binding energy of the MgZn2 phase, as compared with the Al2CuMg phase, give it priority to precipitate during casting and make it easier to re-dissolve during homogenization and solution treatment. What's more, higher elastic constants with severe anisotropy of Young's modulus make undissolved blocks of Al2CuMg phase act as crack initiation, which degrade the performance of the materials.

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基金This work was financially supported by the National Natura...

关键词intermetallic phases homogenization solution first-principles Al alloys

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