Excellent mechanical properties of an ultrafine-grained quasicrystalline strengthened magnesium alloy with multi-modal microstructure
Excellent mechanical properties of an ultrafine-grained quasicrystalline strengthened magnesium alloy with multi-modal microstructure
复制标题
具有多模态微观结构的超细晶准晶强化镁合金具有优异的力学性能
DOI：
10.1016/j.matlet.2013.06.006
复制
发表时间：
2013-09-15
影响因子：
3
通讯作者：
Wang, Zhongchang
中科院分区：
文献类型：
--
作者：
Huang, Hua;Yuan, Guangyin;Wang, Zhongchang
在这项研究中，我们通过在 373 K 温度下以约 9:1 的挤压比常规挤压铸态 Mg-1.5Zn-0.25Gd (at%) 铸锭，开发出具有优异机械性能的超细晶准晶强化镁合金。挤压后，形成多模态微观结构，即表现出大的变形晶粒，周围有细小的动态再结晶晶粒，平均晶粒尺寸小于I pal。挤压样品在环境温度下表现出优异的拉伸性能，极限拉伸强度为417 MPa，0.2%屈服强度为395 MPa，断裂伸长率为8.3%。强度的显着提高主要归因于晶粒细化、细小动态再结晶晶粒内细小析出物的密集分布以及典型基底织构的高强度。 (C) 2013 Elsevier B.V. 保留所有权利。
In this study, we have developed an excellent mechanical properties of an ultrafine-grained quasicrystalline strengthened magnesium alloys by conventional extruding as-casted Mg-1.5Zn-0.25Gd (at%) ingot at 373 K with an extrusion ratio of about 9:1. After extrusion, multi-modal microstructure was formed, i.e. exhibited large deformed grains surrounded by fine dynamical recrystallization grains and the mean grain sizes smaller than I pal. The extruded sample shows excellent tensile properties at ambient temperature with ultimate tensile strength of 417 MPa, 0.2% proof stress of 395 MPa and elongation to failure of 8.3%. The notable improvement in strength mainly attributed to the grain refinement, dense distribution of the fine precipitates inside the fine dynamical recrystallization grains and the high intensity of typical basal texture. (C) 2013 Elsevier B.V. All rights reserved.