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对轴位向在极射投影三角形中部的高纯度铌单晶进行了拉、压以及拉—压交替形变试验,试验温度为77°K——室温。在～200°K以上滑移沿(■01)或最大分切应力面(mrss面)进行;在低温下则主要沿(0■1)面发生反常滑移。在室温试验中未见流变应力不对称性,但随着试验温度的下降,发现压缩形变的抗力比拉伸形变抗力增长得更快,在77°K下压缩流变应力比拉伸流变应力高约l5％。在现有的体心立方金属形变理论基础上,对此结果进行了分析讨论。
The axial compression and pull-pressure alternating deformation tests were carried out on the high purity niobium single crystal in the middle of the projection triangle in the axial direction. The test temperature was 77 ° K- room temperature. The slip occurs above (~ 01 °) or at the maximum stress plane (mrss) above ~ 200 ° K, whereas the slip occurs mainly along the (0 ■ 1) plane at low temperatures. At room temperature, no flow stress asymmetry was observed, but as the test temperature decreased, it was found that the resistance to compressive deformation increased more rapidly than the tensile deformation resistance. At 77 ° K, the compressive flow stress ratio High stress about l5%. Based on the existing body-centered cubic metal deformation theory, the result is analyzed and discussed.