Development of Advanced Heat Resistant Aluminides Produced by ma Process

先进耐热铝化物的研制

• 批准号: 02555142
• 负责人: KOJIMA Yo
• 金额: $ 4.16万
• 依托单位: Nagaoka University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02555142/
• 关键词: Intermetallic compound; Dual phase; Mechanical alloying; Powder metallurgy; Aluminide; NiAl; Ni_3Al; 2柤 アルミナイド; HIP

The intermetallics that belong to Ni-Nb-Al system, (Ni_3Al+Ni_3Nb), (NiAl + NiNbAl), (NiAl+Ni_3Al), NiAl and Ni_3Al were produced by mechanical alloying(MA)process with a view to refining microstructures. MA was carried out in the attritor mill using pure nickel, pure niobium powder and NiAl prealloyed powder as starting materials. MA powders were consolidated using the vacuum hot pressing.Sintered aluminides showed fine grain structures with average grain diameter under 5 mu m and relative density above 96%. The combination of high strength and large fracture strain of more than 10% at room temperatures was confirmed by compression test for each aluminide except for both(Ni_3AI+Ni_3Nb) and (NiAl+NiNbAl). At high temperatures, these aluminides exhibited a steady state deformation and no fracture during testing. The strain rate sensitivity exponent of m (>O. 6) was observed for (Ni_3Al+Ni_3Nb) at 1173K. Such large m value more than 0.3 is believed to be associated with the development of superplasticity.

采用机械合金化(MA)工艺制备了属于Ni-Nb-Al系的金属间化合物(Ni_3Al+Ni_3Nb)、(NiAl+NiNbAl)、(NiAl+Ni_3Al)、NiAl和Ni_3Al,以细化显微组织。 MA是在磨碎机中使用纯镍、纯铌粉末和NiAl预合金粉末作为起始材料进行的。 MA粉末采用真空热压固结而成。烧结铝化物具有细晶结构，平均粒径在5μm以下，相对密度在96%以上。除(Ni_3Al+Ni_3Nb)和(NiAl+NiNbAl)外，通过压缩试验证实了每种铝化物在室温下均具有高强度和大于10%的大断裂应变。在高温下，这些铝化物表现出稳态变形并且在测试过程中没有断裂。在1173K下观察到(Ni_3Al+Ni_3Nb)的应变率敏感性指数m(>O.6)。如此大的m值超过0.3被认为与超塑性的发展有关。