Li Z K, Fu H M, Sha P F, Zhu Z W, Wang A M, Li H, Zhang H W, Zhang H F, Hu Z Q
1] Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang. 110016, China [2] University of Chinese Academy of Sciences, Beijing. 100049, China.
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang. 110016, China.
Sci Rep. 2015 Mar 11;5:8967. doi: 10.1038/srep08967.
The interaction between active element Zr and W damages the W fibers and the interface and decreases the mechanical properties, especially the tensile strength of the W fibers reinforced Zr-based bulk metallic glass composites (BMGCs). From the viewpoint of atomic interaction, the W-Zr interaction can be restrained by adding minor elements that have stronger interaction with W into the alloy. The calculation about atomic interaction energy indicates that Ta and Nb preferred to segregate on the W substrate surface. Sessile drop experiment proves the prediction and corresponding in-situ coating appears at the interface. Besides, the atomic interaction mechanism was proven to be effective in many other systems by the sessile drop technique. Considering the interfacial morphology, Nb was added into the alloy to fabricate W/Zr-based BMGCs. As expected, the Nb addition effectively suppressed the W-Zr reaction and damage to W fibers. Both the compressive and tensile properties are improved obviously.
活性元素Zr与W之间的相互作用会损坏W纤维及其界面，并降低力学性能，尤其是W纤维增强Zr基块状金属玻璃复合材料（BMGCs）的拉伸强度。从原子相互作用的角度来看，通过向合金中添加与W具有更强相互作用的微量元素，可以抑制W-Zr相互作用。关于原子相互作用能的计算表明，Ta和Nb倾向于在W基体表面偏析。座滴实验证实了这一预测，并且在界面处出现了相应的原位涂层。此外，通过座滴技术证明原子相互作用机制在许多其他体系中也是有效的。考虑到界面形态，向合金中添加Nb以制备W/Zr基BMGCs。正如预期的那样，添加Nb有效地抑制了W-Zr反应以及对W纤维的损坏。压缩性能和拉伸性能均得到明显改善。
