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首页> 外文期刊>Materials Science and Engineering >Dynamic dissolution and transformation of LPSO phase during thermomechanical processing of a GWZ magnesium alloy
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Dynamic dissolution and transformation of LPSO phase during thermomechanical processing of a GWZ magnesium alloy

机译：GWZ镁合金热机械加工过程中LPSO相的动态溶解与转化

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摘要

An extruded Mg-8.2Gd-3.6Y-1.6Zn-0.5Zr alloy containing blocky long-period stacking-ordered (IPSO) phase was subjected to a set of single and multi-pass friction stir processing trials. The evolutions of the microstructure and the secondary phases were investigated in details, and the correlations between the microstructure, the macro-texture and the room-temperature mechanical properties were explained. An outstanding grain refinement was achieved after applying just one friction stir processing pass, while the coarse blocky long-period stacking ordered phase was significantly broken into the fine particles. The occurrence of particle-stimulated nucleation process was identified as the main recrystallization mechanism, and this in turn could lead to appreciable texture weakening. In addition, some of the secondary phases were dissolved in the matrix and successively transformed into cubic RE-rich particles dynamically. The capability of phase transformation and dynamic precipitation were intensified through higher passes and the volume fraction of dispersed RE-rich particles located at the grain boundaries was increased. An ultrafine and relatively homogenous microstructure was also developed at the highest level of imposed equivalent strain. In the current work, the room-temperature mechanical properties of the thermomechanically processed materials were also explored. In spite of previous reports on the severely deformed magnesium alloys, the strength and ductility were significantly improved after friction stir processing. These were explained considering the grain refinement, fragmentation, transformation, suitable distribution of the second phases, and texture weakening which was resulted from the activation of non-basal slip systems.
机译：含有嵌体的长期堆叠有序（IPSO）相的挤出的Mg-8.2GD-3.6Y-1.6ZN-0.5ZR合金经受一组单一和多通摩擦搅拌加工试验。详细研究了微观结构和二次相的演变，并解释了微观结构，宏观纹理和室温机械性能之间的相关性。在仅施加一个摩擦搅拌过程之后实现了一个突出的晶粒细化，而粗块的长期堆叠有序相位被显着分解成细颗粒。鉴定颗粒刺激的成核过程的发生作为主要的重结晶机制，反过来可能导致明显的质地削弱。另外，将一些二次相溶解在基质中并动态地依次转化成立方重新富含颗粒。通过较高的通过加强相变和动态沉淀的能力，并且位于晶界处的分散的重新富含颗粒的体积分数增加。在最高水平的施加的等效菌株的最高水平上也开发出超细和相对均匀的微观结构。在目前的工作中，还探讨了热机械加工材料的室温机械性能。尽管先前关于严重变形的镁合金的报道，摩擦搅拌加工后强度和延展性显着提高。考虑到谷物细化，碎裂，转化，合适的第二阶段的合适分布以及由非基础滑移系统的激活产生的纹理弱化来解释。

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