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Ni-Nb-Al系金属间化合物（Ni_3Al+Ni_3Nb）、（NiAl + NiNbAl）、（NiAl+Ni_3Al）、NiAl和Ni_3Al。以纯镍粉、纯铌粉和NiAl预合金粉为原料，在球磨机中进行机械合金化。采用真空热压法对MA粉末进行了烧结，烧结后的Al_2 O_3具有细小的晶粒结构，平均粒径小于5 μ m，相对密度大于96%。除了（Ni_3Al +Ni_3Nb）和（NiAl+NiNbAl）两种铝化物外，其它铝化物均具有较高的强度和大于10%的室温断裂应变。在高温下，这些铝化物表现出稳态变形，在测试过程中没有断裂。应变速率敏感指数m（> 0. 6)（Ni_3Al+Ni_3Nb）在1173 K时观察到了一个明显的相变。大于0.3的m值被认为与超塑性的发展有关。

项目成果

S. Ochiai, I. Yamada, Y. Kojima: "Development of High Strength and Superplasticity in the Heat-refined (NiAl+Ni_3Al) Two-phase Alloy" J. Japan Inst. Metals. 54-3. 1990 (301-306)

S. Ochiai、I. Yamada、Y. Kojima：“热精炼 (NiAl Ni_3Al) 两相合金的高强度和超塑性的发展” J. Japan Inst.

S.Ochiai: "Microstructures and Mechanical Properties of Ni-Nb Aluminides Produced by MA Process" ISIJ International. 31. 1106-1112 (1991)

S.Ochiai：“MA 工艺生产的 Ni-Nb 铝化物的微观结构和机械性能”ISIJ International。

落合 鍾一: "(NiAl+Ni_3Al)2相合金の熱調質処理による高強度化と超塑性の発現" 日本金属学会誌. 54. 301-306 (1990)

Shoichi Ochiai：“通过 (NiAl+Ni_3Al) 两相合金的热处理提高强度并发展超塑性” 日本金属学会杂志 54. 301-306 (1990)。