Ta 对镍基单晶超级合金拉伸行为和变形机制的影响

IF 2.9 2区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Acta Metallurgica Sinica-English Letters Pub Date : 2024-07-22 DOI:10.1007/s40195-024-01753-6
Mingtao Ge, Xinguang Wang, Yongmei Li, Zihao Tan, Xipeng Tao, Yanhong Yang, Liang Wang, Chunhua Zhang, Song Zhang, Yizhou Zhou, Xiaofeng Sun
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摘要

本研究探讨了 Ta 对镍基单晶超级合金从室温到高温的拉伸行为和变形机制的影响。研究结果表明,Ta 含量越高,合金在不同温度下的拉伸性能越好。由于不同温度下的变形机制不同,Ta 对拉伸变形的影响也各不相同。在室温下,较高的 Ta 含量会增强固溶强化,从而提高 6.5Ta 合金的抗拉强度。6.5Ta 合金经过标准热处理后,次生γʹ相的析出会阻碍位错的移动。当温度升高到 760 ℃ 时,较高的 Ta 含量不仅促进了堆叠断层的相互作用,形成阻碍位错运动的 Lomer-Cottrell (L-C)锁,还减少了位错堆积群的出现,从而提高了屈服强度。1120 ℃时,由于Ta添加量越高,合金中γʹ相的γ通道越窄,APB能越高,位错的绕过和剪切过程分别受到阻碍。同时,在 6.5Ta 合金中形成了更密集、更规则的位错网络,从而提高了 6.5Ta 合金的抗拉强度。该研究系统地探讨了 Ta 对三种不同温度下拉伸行为的影响,为今后设计镍基单晶超合金提供了重要的理论依据。
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Effect of Ta on Tensile Behavior and Deformation Mechanism of a Nickel-Based Single Crystal Superalloy

The effects of Ta on the tensile behavior and deformation mechanisms of a Ni-based single crystal superalloy were investigated in this study from room temperature to elevated temperature. The findings demonstrated that the higher content of Ta could improve the tensile properties of the alloy at different temperatures. Due to the different deformation mechanisms at various temperatures, the influence of Ta on tensile deformation varied. At room temperature, the higher content of Ta enhanced the solid solution strengthening, which would enhance the tensile strength of 6.5Ta alloy. After standard heat treatment of 6.5Ta alloy, precipitation of the secondary γʹ phase would hinder the movement of dislocations. When the temperature was elevated to 760 °C, the higher content of Ta not only promoted the interaction of stacking faults to form Lomer–Cottrell (L-C) locks that impeded dislocation motion, but also reduced the occurrence of dislocation pile-up groups, thus enhancing the yield strength. At 1120 °C, due to the narrower γ channels and higher APB energy in γʹ phase of the alloy with higher Ta addition, the processes of bypassing and shearing of dislocations were hindered, respectively. Meanwhile, the denser and more regular dislocation networks were formed in 6.5Ta alloy; and thus, the tensile strength of 6.5Ta alloy was enhanced. This study systematically investigated the effect of Ta on the tensile behavior at three different temperatures, which provided an important theoretical basis for the design of nickel-based single crystal superalloys in the future.

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来源期刊
Acta Metallurgica Sinica-English Letters
Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
6.60
自引率
14.30%
发文量
122
审稿时长
2 months
期刊介绍: This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.
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