On Shear Testing of Single Crystal Ni-Base Superalloys

On Shear Testing of Single Crystal Ni-Base Superalloys
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单晶镍基高温合金的剪切试验研究

DOI:
10.1007/s11661-018-4726-9
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发表时间:
2018
期刊:
Metallurgical and Materials Transactions A
影响因子:
--
通讯作者:
G. Laplanche
G. Laplanche
中科院分区:
--
文献类型:
--
作者:
G. Eggeler;N. Wieczorek;F. Fox;S. Berglund;D. Bürger;A. Dlouhy;P. Wollgramm;K. Neuking;J. Schreuer;L. Agudo Jácome;S. Gao;A. Hartmaier;G. Laplanche

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剪切试验有助于更好地了解镍基高温合金单晶的塑性变形。在本研究中,剪切试验进行了讨论,特别强调其优点和缺点。简要回顾了高温(T ≤ 1000 °C)和低应力(τ ≤ 200 MPa)蠕变状态下获得的关键力学和显微组织结果。新的三维立体STEM图像的位错亚结构,在剪切蠕变变形过程中形成在这个政权。然后显示在较低温度(T< 800 °C)和较高应力(τ> 600 MPa)下进行双剪切蠕变测试时需要考虑哪些新方面。在这种蠕变状态下,宏观晶体学[11−2](111)剪切系统的变形速度明显快于[01−1](111)系统。这代表了最近提出的新平面断层成核情景的直接力学证据(Wuet al. in Acta Mater 144:642-655,2018)。双剪切蠕变试样的几何形状启发了微观mechanicalin-situshear测试试样。此外,原位SEM剪切试样可以从先前的枝晶和枝晶间区域进行FIB微加工。具有较低γ′体积分数的枝晶区域显示出较低的临界分辨剪切应力。
Shear testing can contribute to a better understanding of the plastic deformation of Ni-base superalloy single crystals. In the present study, shear testing is discussed with special emphasis placed on its strengths and weaknesses. Key mechanical and microstructural results which were obtained for the high-temperature (T≈ 1000 °C) and low-stress (τ≈ 200 MPa) creep regime are briefly reviewed. New 3D stereo STEM images of dislocation substructures which form during shear creep deformation in this regime are presented. It is then shown which new aspects need to be considered when performing double shear creep testing at lower temperatures (T< 800 °C) and higher stresses (τ> 600 MPa). In this creep regime, the macroscopic crystallographic [11−2](111) shear system deforms significantly faster than the [01−1](111) system. This represents direct mechanical evidence for a new planar fault nucleation scenario, which was recently suggested (Wuet al. in Acta Mater 144:642–655, 2018). The double shear creep specimen geometry inspired a micro-mechanicalin-situshear test specimen. Moreover, thein-situSEM shear specimen can be FIB micro-machined from prior dendritic and interdendritic regions. Dendritic regions, which have a lowerγ′ volume fraction, show a lower critical resolved shear stress.
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