Perturbed angular correlation studies of uniaxial compressive stressed zinc, titanium, rutile, Ti2AlN, and Nb2AlC

Perturbed angular correlation studies of uniaxial compressive stressed zinc, titanium, rutile, Ti2AlN, and Nb2AlC
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单轴压应力锌、钛、金红石、Ti2AlN 和 Nb2AlC 的扰动角度相关研究

DOI:
10.1088/0953-8984/26/29/295501
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发表时间:
2014
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
M.W. Barsoum
M.W. Barsoum
中科院分区:
--
文献类型:
--
作者:
C. Brüsewitz;U. Vetter;H. Hofsäss;M.W. Barsoum

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利用111 In-111 Cd探针原子的微扰角关联方法,原位研究了室温下多晶Ti 2AlN和Nb 2AlC、钛和锌以及金红石样品在循环单轴压缩载荷作用下电场梯度的变化.四极耦合常数ν Q的负载依赖性在钛和锌中较大,而在Ti 2AlN、Nb 2AlC和金红石中较小。电场梯度分布宽度的可逆和不可逆的增加被发现在负载和释放负载后,分别。位错的湮灭以及弹性变形被认为是导致可逆行为的原因。这种不可逆的响应是由位错和点缺陷密度的永久性增加引起的。变形引起的电场梯度的加宽可以通过变形样品的后退火来恢复。
We use the perturbed angular correlation method with 111 In-111 Cd probe atoms to in situ study the changes in the electric field gradient at room temperature of polycrystalline Ti 2 AlN and Nb 2 AlC, titanium and zinc, and rutile samples, as a function of cyclic uniaxial compressive loads. The load dependence of the quadrupole coupling constant ν Q was found to be large in titanium and zinc but small in Ti 2 AlN, Nb 2 AlC and rutile. Reversible and irreversible increases in the electric field gradient distribution widths were found under load and after releasing the load, respectively. Annihilation of dislocations, as well as elastic deformation, are considered to contribute to the reversible behavior. The irreversible response must be caused by a permanent increase in dislocation and point defect densities. The deformation induced broadening of the electric field gradient can be recovered by post-annealing of the deformed sample.
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