材料科学
微观结构
放电等离子烧结
合金
材料的强化机理
降水
氧化物
冶金
纳米团簇
粒度
晶界
纳米技术
物理
气象学
作者
Li‐Ying Yao,Yimin Gao,Yefei Li,Yudong Huang,Yiran Wang,Peng Xiao,Qingkun Liu
标识
DOI:10.1016/j.jallcom.2022.166155
摘要
Nanostructural Y-Zr-O oxide dispersion-strengthened (ODS) Mo alloys were in-situ prepared based on the dissolution and re-precipitation strategy of oxides during mechanical alloying (MA) and spark plasma sintering (SPS). The effect of Zr addition on the microstructures and mechanical properties of Mo-1Y2O3-xZr alloy (x = 0.3, 0.6, 0.9, and 1.2 wt%) was investigated. The results show that both intragranular and intergranular Y-Zr-O particles are nanoscale and non-stoichiometric, possessing a different Y/Zr ratio. The Y-Zr-O particles and ultrafine grain structure jointly contribute to high strength (1.87 times over pure Mo) and simultaneously great elongation (2.98 times over pure Mo) of Mo-1Y2O3-0.3Zr alloy. The yield strength and elongation are reduced as Zr addition beyond 0.6 wt%, owing to the aggregation of Y-Zr-O particles at grain boundaries. The theoretical calculation indicates that the strength is mainly affected by grain refinement strengthening and Orowan precipitate strengthening. But the strength is less predicted due to a great amount of Y-Zr-O nanoclusters smaller than 5 nm cannot be considered in the statistical analysis by conventional TEM.
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