Fragmentation of Mg24Y5 intermetallic particles in an Mg-Zn-Y alloy during the equal channel angular pressing
Fragmentation of Mg24Y5 intermetallic particles in an Mg-Zn-Y alloy during the equal channel angular pressing
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DOI：
10.1016/j.matchar.2017.04.016
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发表时间：
2017-07
影响因子：
4.7
通讯作者：
Jing Wu;Q. Shi;Y. Chiu
中科院分区：
文献类型：
--
作者：
Jing Wu;Q. Shi;Y. Chiu
用透射菊池衍射仪(TKD)和透射电子显微镜(TEM)研究了等通道转角挤压(ECAP)过程中Mg_(24)Y_5金属间化合物颗粒的碎裂。在ECAP过程中，观察到粗大的Mg24Y5颗粒中形成了微裂纹，裂纹内部有动态再结晶的镁晶粒。Mg24Y5也发生了动态再结晶，颗粒尺寸变小。再结晶后的Mg24Y5颗粒呈不规则形状或颈缩状，有利于小颗粒的弥散。Mg24Y5颗粒的碎裂也使周围的镁颗粒尺寸变小。金属间化合物颗粒的细化有望提高合金的强度和塑性。
Transmission Kikuchi diffraction (TKD) and transmission electron microscopy (TEM) have been used to investigate the fragmentation of Mg24Y5intermetallic particles in an Mg-Zn-Y alloy during the equal channel angular pressing (ECAP). During the ECAP process, micro-cracks formed in large Mg24Y5particles and dynamic recrystallised Mg grains were observed inside the crack. The dynamic recrystallisation of the Mg24Y5also occurred and the particle size has been reduced. The recrystallised Mg24Y5particles assume either an irregular or necking shape contributing to the dispersion of the small particles. The fragmentation of the Mg24Y5particles also reduced the grain size of the surrounding magnesium grains. The refinement of the intermetallic particles is expected to improve the strength and ductility of the alloys.