The precipitation behavior and mechanical properties of Cu–Ni–Mn–Fe alloy during aging under elevated compression stresses
The precipitation behavior and mechanical properties of Cu–Ni–Mn–Fe alloy during aging under elevated compression stresses
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DOI：
10.1088/2053-1591/abc4b4
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发表时间：
2020-11
影响因子：
2.3
通讯作者：
Hao Shi;J. Zou;Jingren Chen;Peng Xiao;F. Cao;S. Liang
中科院分区：
文献类型：
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作者：
Hao Shi;J. Zou;Jingren Chen;Peng Xiao;F. Cao;S. Liang
制备了Cu-Ni-Mn-Fe合金，研究了其在高压应力时效过程中的析出行为和力学性能。采用透射电子显微镜（TEM）、扫描电子显微镜（SEM）、X射线衍射仪（XRD）、硬度和拉伸试验等方法进行了研究。结果表明，应力时效处理使Cu-Ni-Mn-Fe合金基体中形成细小的等轴晶和孪晶。在应力时效过程中，θ-MnNi析出相的密度先减小后增大。当应力从220 MPa进一步增加到385 MPa时，由于蠕变变形，空位浓度和位错密度迅速增加，而应变诱导效应促进了θ-MnNi的析出。结果表明：Cu-Ni-Mn-Fe合金的抗拉强度和硬度先降低后升高，在385 MPa的压应力下，Cu-Ni-Mn-Fe合金的抗拉强度和硬度分别为890 MPa和274 HB，伸长率保持在8.72%。这主要是由于在时效过程中施加压应力，可以提高合金的强度和塑性。
The Cu–Ni–Mn–Fe alloy is prepared to study its precipitation behavior and mechanical properties during aging under elevated compression stresses. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), x-ray diffraction (XRD), hardness and tensile tests are used for this investigation. The results indicate that the stress-aging treatment leads to the formation of fine, equiaxed grains and twins within the matrix of Cu–Ni–Mn–Fe alloy. During the stress-aging, the density of θ-MnNi precipitates initially decreases and then increases. The stress is further increased from 220 to 385 MPa, the vacancy concentration and dislocation density increase rapidly owing to creep deformation, while the strain-induced effect accelerates the precipitation of θ-MnNi. The results show that the tensile strength and hardness of Cu–Ni–Mn–Fe alloy initially decrease and then increase, and the tensile strength and hardness of the Cu–Ni–Mn–Fe alloy are 890 MPa and 274 HB under the compressive stress of 385 MPa, and the elongation remains at 8.72%. It is mainly attributed to the application of compression stresses during aging, which can enhance both the strength and ductility of the alloy.