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Orientation and temperature dependence of yielding and deformation behavior of a nickel-base single crystal superalloy

机译：镍基单晶高温合金的屈服和变形行为的取向和温度依赖性

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摘要

Single crystal nickel-base superalloy SRR99 with orientation near <001>, <011> and <111> were tension tested at the temperature range from 20 to 900 ℃. The experimental results showed that yielding strength of SRR99 alloy was anisotropic at all tested temperatures. The deformation mechanism was characterized by the matrix dislocation propagating on octahedral slip systems and shearing of γ' particles by dislocation pairs, loops and superlattice stacking faults. Meanwhile, the cross-slip of screw dislocations within γ' was thought to account for the tensile anisotropy. Fracture behavior was investigated by optical microscopy (OM) and scanning electron microscopy (SEM). It is of interest to note that the fracture surfaces of the three orientated samples tested at intermediate temperature indicate shearing rupture characteristic along {111} crystal plane.
机译：在20至900℃的温度范围内对取向接近<001>，<011>和<111>的单晶镍基高温合金SRR99进行了拉伸试验。实验结果表明，在所有测试温度下，SRR99合金的屈服强度都是各向异性的。形变机理的特征是基体位错在八面体滑动系统上传播，并通过位错对，环和超晶格堆积断层剪切γ′粒子。同时，认为γ'内的螺旋位错的交叉滑动是拉伸各向异性的原因。通过光学显微镜（OM）和扫描电子显微镜（SEM）研究断裂行为。值得注意的是，在中间温度下测试的三个取向样品的断裂表面表明沿{111}晶面的剪切断裂特性。

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  • 来源
    《Materials Science and Engineering》 |2008年第3期|144-150|共7页
  • 作者

    LN. Wang; Y. Liu; J.J. Yu; Y. Xu; X.F. Sun; H.R.Guan; Z.Q.Hu;

  • 作者单位

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, PR China Graduate School of Chinese Academy of Sciences, Beijing, 100039, PR China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, PR China Graduate School of Chinese Academy of Sciences, Beijing, 100039, PR China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, PR China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, PR China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, PR China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, PR China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    single crystal superalloy; yield strength; dislocations; γ' Precipitate;

    机译：单晶高温合金屈服强度脱臼;γ'沉淀;

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