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Thermally activated dislocation mechanism in Mo studied by indentation,compression and impact testing

机译:通过压痕,压缩和冲击测试研究了MO的热活化位错机制

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摘要

Body-centered cubic metals like molybdenum and tungsten are interesting structural materials for high-temperature applications. These metals, are however, brittle at low homologous temperature, caused by the limited mobility of screw dislocations. In this study, the thermally activated deformation mechanisms in bcc Mo have been investigated using strain rate jump nanoindentation and compression tests as well as Charpy V-notch impact testing. The material shows a significant softening with increasing temperature and a maximum in strain rate sensitivity is found at the critical temperature, before decreasing again in the ductile regime. The activation volume, however, showed a distinct increase from about 5 b~3 at the onset of the brittle to ductile transition temperature. Here we propose to use temperature-dependent nanoindentation strain rate jump testing and the activation volume as a complementary approach to provide some indication of the brittle to ductile transition temperature of bcc metals.
机译:钼和钨等体为中心的立方金属是高温应用的有趣结构材料。然而,这些金属在低同质温度下脆,由螺杆脱位的有限迁移率引起。在该研究中,使用应变速率跳跃纳米狭窄和压缩测试以及夏比V-intch冲击试验研究了BCC MO中的热活化变形机制。该材料表明,随着温度的增加,在临界温度下发现了在临界温度下的最大值,在延展性方案中再次下降之前,最大在临界温度下发现。然而,活化体积显示出在脆性至韧性转变温度的脆弱中的约5b〜3的不同增加。在这里,我们建议使用温度依赖性纳米凸缘应变率跳跃测试和活化体积作为互补方法,以提供BCC金属的脆性转变温度的一些指示。

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  • 来源
    《Journal of Materials Research》 |2021年第12期|2397-2407|共11页
  • 作者单位

    Physical Metallurgy Materials Science Department Technical University of Darmstadt Darmstadt Germany;

    Physical Metallurgy Materials Science Department Technical University of Darmstadt Darmstadt Germany;

    Physical Metallurgy Materials Science Department Technical University of Darmstadt Darmstadt Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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