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Deformation Influences on Microstructure, Mechanical Properties, and Shape Memory Behavior of Cu-AI-Ni-xTi Shape Memory Alloys

机译:Cu-Ai-XTI形状记忆合金微观结构,力学性能和形状记忆行为的变形影响

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摘要

The effects of different deformation percentages on the microstructure and mechanical properties of Cu-Al-Ni-xTi shape memory alloys (SMAs) were investigated. The experimental results demonstrated that the mechanical properties varied in accordance with the parent and precipitate phase formations, morphologies, and orientations. Furthermore, an increase in deformation can cause an effect on the density and movement of dislocations and thus influences the functional properties of the shape memory features. The results revealed that applied deformations of 2% and 4% on Cu-Al-Ni-0.5 wt% Ti SMAs attained the highest fracture and recovery strains by the shape memory effect, respectively. It can be also concluded that the significant features of shape memory alloys are susceptible to changes of the dislocation density and movements with respect to deformation and also depend mainly on the Ti concentration of the matrix, which can be modified via the formation and volume fraction of x-phase precipitates.
机译:研究了不同变形百分比对Cu-Al-Ni-XTI形状记忆合金(SMA)的微观结构和力学性能的影响。实验结果表明,机械性能根据母体和沉淀相,形态和取向而变化。此外,变形的增加会导致对位错的密度和运动的影响,从而影响形状记忆特征的功能性质。结果表明,Cu-Al-Ni-0.5wt%Ti SMA的施加变形分别通过形状记忆效应达到最高的断裂和回收菌株。还可以得出结论,形状记忆合金的显着特征易于对变形的位错密度和运动的变化影响,并且主要取决于基质的Ti浓度,这可以通过形成和体积分数来改变X相沉淀物。

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