精品文档---下载后可任意编辑AgCu 与稀土元素 Y 联合添加对 NiAl 合金显微组织和力学性能的影响的开题报告【摘要】NiAl 合金是一种具有良好高温强度和较高抗氧化性能的高等级结构材料，然而其低温塑性较差，限制了其应用范围。本论文旨在讨论添加AgCu 和 Y 稀土元素对 NiAl 合金组织结构和力学性能的影响。采纳真空自扩散烧结制备 NiAl 合金试样，加入 AgCu 和 Y 元素后进行烧结。通过SEM、TEM 和 XRD 等手段对试样进行组织结构和相组成的分析，使用万能材料试验机对试样进行力学性能测试，并对结果进行统计分析。讨论结果表明，添加 AgCu 和 Y 元素可以显著的提高合金的力学性能，同时改善其低温塑性。其中 AgCu 的加入可引起细晶化，并增加晶界强化作用，而 Y 元素的加入则可形成细小、均匀的 γ'相颗粒，增强合金的强度。本讨论为 NiAl 合金的高性能材料设计和应用提供了一定的理论和实验依据。【关键词】NiAl 合金；AgCu；稀土元素 Y；力学性能；显微组织【Abstract】NiAl alloy is a high-level structural material with good high temperature strength and high oxidation resistance. However, its low temperature plasticity is poor, which limits its application range. This paper aims to study the effect of adding AgCu and Y rare earth elements on the microstructure and mechanical properties of NiAl alloy. NiAl alloy specimens were prepared by vacuum self-diffusion sintering, and AgCu and Y elements were added and sintered. The microstructure and phase composition of the specimens were analyzed by SEM, TEM and XRD, and the mechanical properties were tested by universal material testing machine, and the results were statistically analyzed. The results showed that the addition of AgCu and Y elements can significantly improve the mechanical properties and improve the low temperature plasticity of the alloy. The addition of AgCu can cause refinement of grains and increase the grain boundary strengthening effect, while the addition of Y element can form fine and uniform γ' phase particles and enhance the strength of the alloy. This study provides a certain theoretical and experimental basis for the high-performance material design and application of NiAl alloy.精品文档---下载后可任意编辑【Keywords】NiAl alloy; AgCu; rare earth element Y; mechanical properties; microstructure
