The Effect of Lattice Misfit on Deformation Mechanisms at High Temperature
The Effect of Lattice Misfit on Deformation Mechanisms at High Temperature
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DOI：
10.4028/www.scientific.net/amr.278.144
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
B. Grant;Elisabeth Knoche;M. Preuss;J. Q. da Fonseca;M. Daymond
中科院分区：
文献类型：
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作者：
B. Grant;Elisabeth Knoche;M. Preuss;J. Q. da Fonseca;M. Daymond
如果想要充分挖掘先进镍基高温合金的潜力和发展未来的合金，了解变形机制和微观组织之间的关系是必不可少的。本文采用中子衍射结合晶体塑性建模的方法，对RR1000和720Li合金进行了原位加载实验，研究了和'之间晶格失配的影响。两种合金均经过加工，形成三种简化的单模态γ′显微组织，以确定γ′响应，并在750℃下进行实验。结果表明，在单轴拉伸引起的塑性变形过程中，正错配应变增加了从到'的载荷分配水平。
Understanding the relationship between deformation mechanisms and microstructure is essential if one wants to fully exploit the potential of advanced nickel base superalloys and develop future alloys. In the present work, the influence of the lattice misfit between and ’ has been studied by means of in-situ loading experiments using neutron diffraction in combination with crystal plasticity modelling on RR1000 and Alloy 720Li. Both alloys were processed to generate three simplified uni-modal γ’ microstructures to allow determination of γ’ responses and experiments were carried out at 750°C. The results showed that a positive misfit strain increases the level of load partitioning from to ’ during plastic deformation introduced by uniaxial tensile loading.