材料科学
粒径
合金
极限抗拉强度
相(物质)
色散(光学)
形态学(生物学)
位错
复合材料
粒度
粒子(生态学)
粒度分布
工作(物理)
冶金
化学工程
光学
热力学
化学
物理
海洋学
有机化学
生物
工程类
遗传学
地质学
作者
Zhuangzhi Wu,Na Zhao,Yao Lu,Hai-lang LIU,Bohua Duan,Xin-li LIU,De-zhi WANG
标识
DOI:10.1016/s1003-6326(22)65919-3
摘要
The morphology and size of second phase greatly influence the strengthening effect on oxidation dispersion strengthened Mo alloys. In this work, a novel nanostructuring strategy is adopted to modify the second phase of Y2O3, and the corresponding effects of particle shape and size on mechanical properties of sintered Mo-Y2O3 alloys were investigated. It is found that spherical particles with sizes below 200 nm are preferred due to the dominant intragranular distribution of second phases associated with better strengthening effect originating from dislocation pinning. With smaller particle size of Y2O3 nanospheres (105 nm), the tensile strength of corresponding Mo alloy is enhanced by about 43.8%, much higher than that (8.3%) reinforced by second phase nanospheres with larger particle size (322 nm). Meanwhile, with similar particle size (around 100 nm), the spherical shape exhibits better strengthening effect than the one reinforced by one-dimensional rod-like second phase.
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