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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Physical and Structural Characterization of a Monocrystalline Cu-13.7Al-4.2Ni Alloy Subjected to Thermal Cycling Treatments
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Physical and Structural Characterization of a Monocrystalline Cu-13.7Al-4.2Ni Alloy Subjected to Thermal Cycling Treatments

机译：经受热循环处理的单晶Cu-13.7Al-4.2Ni合金的物理和结构表征

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摘要

A monocrystalline alloy with nominal 82wt pctCu-13.7wt pctAl-4.2wt pctNi composition and exhibiting reversible martensitic transformation (RMT) was subjected to multiple heating and cooling cycles within the RMT range of critical temperatures. Both untreated and cyclic treated alloy samples were characterized by X-ray diffraction, optical microscopy, differential scanning calorimetry, and Vickers microhardness. The results indicated that the alloy presents a complex RMT behavior disclosing a sequence of transformation steps: β_1 ←→ R and R ←→ β'_1 + γ'_1 as well as possible β_1 ←→ β'_1 and β'_1 ←→ γ'_1 direct reactions. The thermal cycling treatment inhibits the development of γ'_1 martensite without much change in both the physical and microstructure characteristics. This suggests a good resistance of the alloy to irreversible structural changes.
机译：在临界温度的RMT范围内，对标称成分为82wt％pctCu-13.7wt％pctAl-4.2wt％pctNi的单晶合金进行多次加热和冷却循环。未经处理和经循环处理的合金样品均通过X射线衍射，光学显微镜，差示扫描量热法和维氏显微硬度进行表征。结果表明，该合金表现出复杂的RMT行为，揭示了一系列转变步骤：β_1←→R和R←→β'_1+γ'_1以及可能的β_1←→β'_1和β'_1←→γ '_1直接反应。热循环处理抑制了γ'_1马氏体的发展，而物理和微观结构特性均没有太大变化。这表明该合金对不可逆的结构变化具有良好的抵抗力。

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