Nanoscale icosahedral quasicrystal phase precipitation mechanism during annealing for Mg–Zn–Gd-based alloys
Nanoscale icosahedral quasicrystal phase precipitation mechanism during annealing for Mg–Zn–Gd-based alloys
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DOI：
10.1016/j.matlet.2014.05.131
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发表时间：
2014-09
影响因子：
3
通讯作者：
Yuan Tian;Hua Huang;G. Yuan;Chunlin Chen;Zhongchang Wang;W. Ding
中科院分区：
文献类型：
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作者：
Yuan Tian;Hua Huang;G. Yuan;Chunlin Chen;Zhongchang Wang;W. Ding
我们对Mg-Zn-Gd基合金退火后的析出颗粒进行了系统的透射电子显微镜研究。结果表明，Mg-Zn相和椭球形二十面体准晶相（I相）在铸态合金中以分配方式析出并分布，这是由于合金元素在铸态合金中的成分偏析所致。合金元素的含量对纳米I相的析出起着决定性的作用。纳米I相的尺寸范围从几个到几十个纳米，揭示了沉淀过程满足经典的成核和生长理论。
We have performed a systematic transmission electron microscopy study of precipitated particles in Mg–Zn–Gd-based alloys after annealing. We find that the Mg–Zn phases and ellipsoidal-shaped icosahedral quasicrystal phases (I-phase) are precipitated and distributed by partition in the grains, which can be attributed to the composition segregation of the alloying elements in the as-cast alloys. The content of alloying element is found to be crucial to the precipitation of nanoscale I-phase. The nanoscale I-phase ranges in size from a few to dozens of nanometers, revealing that the precipitation process satisfies the classical nucleation and growth theory.