Mechanical properties of Mg-8Gd-3Y-0.5Zr alloy with bimodal grain size distributions
Mechanical properties of Mg-8Gd-3Y-0.5Zr alloy with bimodal grain size distributions
复制标题
双峰晶粒尺寸分布的Mg-8Gd-3Y-0.5Zr合金的力学性能
DOI：
10.1016/j.jma.2017.09.004
复制
发表时间：
2017-12-01
影响因子：
17.6
通讯作者：
Dong, J.
中科院分区：
文献类型：
--
作者：
He, J. H.;Jin, L.;Dong, J.
近十年来，Mg-Gd-Y-Zn-Zr合金是一种具有代表性和潜在时效硬化体系，但其力学性能仍然取决于晶粒尺寸及其分布。研究了双峰组织对具有双峰晶粒尺寸分布的Mg-8Gd-3Y-0.5Zr合金力学性能的影响。结果表明，采用热锻、挤压和退火相结合的工艺可以控制细晶粒和粗晶粒的体积分数。而对于目前双峰型晶粒尺寸分布的合金，其强度的提高主要归功于晶粒的细化。双峰晶粒尺寸分布的形貌对合金的延展性有显著影响，随着粗晶体积分数的增加，合金的失效伸长率先增大后减小。探讨了双峰型晶粒尺寸分布对具有双峰型晶粒尺寸结构的Mg-Gd-Y-Zn-Zr合金增韧作用的机理。(c) 2017年由爱思唯尔B.V.代表重庆大学制作和主办。这是一篇基于CC BY-NC-ND许可的开放获取文章。
The Mg-Gd-Y-Zn-Zr alloys are representational and potential age-hardening systems as reported in the past ten years, but their mechanical properties are still dependent on the grain size and its distribution. The effect of bimodal structure on mechanical properties of Mg-8Gd-3Y-0.5Zr alloy with bimodal grain size distributions was investigated. The results suggested that the volume fraction of fine grain (FG) and coarse grain (CG) could be controlled by combined processes of hot forging, extrusion and annealing. And for the present alloys with bimodal grain size distribution, the improvement of strength is still attributed to the grain refinement. The morphology of bimodal grain size distribution has a marked impact on the ductility of the alloy, i.e. with the increase of coarse grain volume fraction, the elongation to failure increases at the beginning and then decreases. The mechanism of the toughening effect of bimodal grain size distribution on the Mg-Gd-Y-Zn-Zr alloys with bimodal grain size structure has been discussed. (c) 2017 Production and hosting by Elsevier B.V. on behalf of Chongqing University. This is an open access article under the CC BY-NC-ND license.