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The temperature dependence of high-temperature strength and deformation mechanism in a single crystal CoNi-base superalloy

机译：单晶CoNi基高温合金中高温强度的温度依赖性和变形机理

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摘要

The thermal stability and high-temperature strength of single crystal CoNi-base superalloys, Co-30Ni-10Al-7W (at%) and Co-30Ni-10Al-7W-2Ta-3Ti (at%), containing gamma'(L1(2)) phase have been investigated. The investigated CoNi-base superalloy with alloying additions of Ti and Ta exhibits excellent gamma' solves temperature, 1236 degrees C, and high-temperature strength, 622 MPa at 900 degrees C, compared to reported gamma'-strengthening Co-base superalloys. Detailed analyses of the deformation mechanisms for the investigated alloys were carried out by using the transmission electron microscopy (TEM) characterization. Two different transitions of deformation mechanisms for the gamma' phase, from superpartial dislocation shearing to dislocation bypassing and to stacking fault shear, occurred in the investigated alloys as the deformation temperature increased above the peak temperatures. Meanwhile, the high-temperature strength of the investigated alloys largely decreased as the transitions of deformation mechanism took place. The influence of alloying effects on energies of faults and the relationship between high-temperature strength and deformation mechanisms were discussed.
机译：单晶CoNi基高温合金Co-30Ni-10Al-7W（at％）和Co-30Ni-10Al-7W-2Ta-3Ti（at％）的热稳定性和高温强度，含γ'（L1（ 2））相已被调查。与报道的γ'-强化Co-基超合金相比，所研究的添加了Ti和Ta合金化的CoNi基超合金具有出色的γ'溶解温度（1236摄氏度）和900℃下的高温强度（622 MPa）。通过使用透射电子显微镜（TEM）表征，对所研究合金的变形机理进行了详细分析。当变形温度升高到峰值温度以上时，在研究的合金中发生了γ'相变形机制的两种不同过渡，从超部分位错剪切到位错旁路和堆垛层错剪切。同时，随着变形机理的转变，被研究合金的高温强度大大降低。讨论了合金化作用对断层能量的影响以及高温强度与变形机理之间的关系。

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  • 来源
    《Materials Science and Engineering》 |2018年第26期|114-120|共7页
  • 作者

    Fan Zhongding; Wang Chenchong; Zhang Chi; Yu Yunhe; Chen Hao; Yang Zhigang;

  • 作者单位

    Tsinghua Univ, Key Lab Adv Mat, Minist Educ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China;

    Northeastern Univ, Sch Mat Sci & Engn, State Key Lab Rolling & Automat, Shenyang 110819, Liaoning, Peoples R China;

    Tsinghua Univ, Key Lab Adv Mat, Minist Educ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China;

    Tsinghua Univ, Key Lab Adv Mat, Minist Educ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China;

    Tsinghua Univ, Key Lab Adv Mat, Minist Educ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China;

    Tsinghua Univ, Key Lab Adv Mat, Minist Educ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Cobalt-base superalloy; Transmission electron microscopy; Compression test; Dislocation; Stacking fault;

    机译：钴基高温合金;透射电镜;压缩试验;位错;堆垛层错;

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