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通过机械合金化+热压烧结工艺制备了Cr-10Ta和Cr-10Ta-20Mo合金,研究了添加20%Mo对Laves相Cr-Ta合金组织及室温力学性能的影响。结果表明,Cr、Ta和Mo元素粉经球磨25 h后在1350℃×1 h热压工艺下可获得组织细小均匀的高致密度Cr-10Ta和Cr-10Ta-20Mo合金。Cr-10Ta中生成的Laves相Cr_2Ta是室温下稳定的C15结构,而添加20%Mo会使合金中生成的Laves相Cr_2Ta发生相转变,形成亚稳态的C14型Laves相。所制备的Cr-10Ta-20Mo合金表现出良好的细晶和合金化强韧化效果,室温下的硬度为6.89 GPa,断裂韧性大于7.91 MPa·m1/2,屈服强度和抗压强度分别达2635、3364 MPa,压缩应变为6.7%。
Cr-10Ta and Cr-10Ta-20Mo alloys were prepared by mechanical alloying and hot pressing sintering process. The effects of adding 20% Mo on the microstructure and room-temperature mechanical properties of Laves phase Cr-Ta alloy were investigated. The results show that fine Cr-10Ta and Cr-10Ta-20Mo alloy with fine structure and uniform microstructure can be obtained by hot pressing at 1350 ℃ for 1 h after milling Cr, Ta and Mo powders for 25 h. The Laves phase Cr_2Ta formed in Cr-10Ta is a stable C15 structure at room temperature. Adding 20% Mo causes phase transformation of the Laves phase Cr_2Ta formed in the alloy to form a metastable C14 Laves phase. The prepared Cr-10Ta-20Mo alloy has good fine grain and alloying toughening effect. The hardness at room temperature is 6.89 GPa, the fracture toughness is more than 7.91 MPa · m1 / 2, and the yield strength and compressive strength are respectively 2635 , 3364 MPa, compressive strain was 6.7%.