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利用扫描电镜和透射电镜及拉伸试验机等研究了一种自行设计的低Re第二代镍基单晶高温合金在不同温度下的拉伸变形行为及微观机制。结果表明：合金的屈服强度和抗拉强度随试验温度的升高先增加后降低，并表现出明显的反常屈服现象，760℃时合金的屈服强度达到峰值1099 MPa;断口分析表明在室温和760℃下合金的断裂模式为纯剪切断裂，而在980℃下转变为微孔聚集型断裂；合金在室温下的主要变形机制为单根超位错和小宽度层错剪切γ′相，在760℃下的变形机制为大宽度层错剪切γ′相，而在980℃下变形机制转变为带有反相畴界(APB)的超位错对剪切γ′相。
Abstract：The tensile deformation behavior and micro-mechanism of a self-designed second-generation nickel base single crystal superalloy with low Re at different temperatures were studied by scanning electron microscopy, transmission electron microscopy and tensile testing machine. The results show that the yield strength and tensile strength of the alloy first increase and then decrease with the increase of test temperature, and show obvious abnormal yield phenomenon. The yield strength of the alloy reaches the peak value of 1099 MPa at 760 ℃. The fracture surface analysis shows that the fracture mode of the alloy is pure shear fracture at room temperature and 760 ℃, while it changes to microporous aggregation fracture at 980 ℃. The main deformation mechanisms of the alloy at room temperature are single super dislocation and small width stacking fault shear γ′ phase, the deformation mechanism at 760 ℃ is large width stacking fault shear γ′ phase, and at 980 ℃, the deformation mechanism changes to super dislocation pair with anti-phase boundary(APB) shear γ′ phase.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2022-0115
中图分类号:TG132.3
引用信息:
[1]丁方政,陈昊,许剑伟,等.一种低Re第二代镍基单晶高温合金的拉伸性能[J],2022,43(09):87-93.DOI:10.13289/j.issn.1009-6264.2022-0115.