Phase transition zones in compositionally complex alloy films influenced by varying Al and Ti content
Phase transition zones in compositionally complex alloy films influenced by varying Al and Ti content
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DOI：
10.1016/j.surfcoat.2021.127651
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发表时间：
2021-08
影响因子：
5.4
通讯作者：
Daniel C. Goodelman;D. E. White;A. Hodge
中科院分区：
文献类型：
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作者：
Daniel C. Goodelman;D. E. White;A. Hodge
采用磁控共溅射合成技术，利用扫描电镜、x射线衍射和能量色散x射线能谱技术对复合合金（CCAs）中AlCrFeNiTi和AlCoFeNiTi族合金元素组成变化引起的相变化进行了研究。通过改变提供给Al或Ti目标的输入功率以及衬底象限位置，可以引入成分改变。Al和Ti之间存在一种协同关系，其中这两种元素相互竞争驱动相形成，并且发现用尺寸相似但结构不同的Co取代Cr会进一步影响相形成。研究样品的结晶度与Ti和Al含量有关，以强调每个CCA家族发生相变的不同成分。采用纳米压痕法研究了不同相对力学性能的影响，结果表明，非晶样品的硬度和模量普遍低于晶相和“混合”相样品。这项工作强调了如何使用溅射来控制CCA家族中的单个元素，以研究它们的原子特性如何有助于相形成和结晶度。
Phase changes due to compositional variation of alloying elements in the AlCrFeNiTi and AlCoFeNiTi families of compositionally complex alloys (CCAs) were investigated by employing magnetron co-sputtering synthesis techniques and microstructural characterization via scanning electron microscopy, X-ray diffraction, and energy dispersive X-ray spectroscopy. Compositional alterations were introduced by varying the input power provided to either an Al or Ti target, as well as by the substrate quadrant location. A synergistic relationship between Al and Ti was observed in which both elements compete to drive phase formation, and was revealed to be further influenced by substituting Cr with similarly sized, but structurally dissimilar, Co. The crystallinity of the studied samples was mapped with respect to Ti and Al content to emphasize the distinct compositions where phase transitions occur for each CCA family. Nanoindentation was employed to study how different phases affect the mechanical properties, with results indicating that amorphous samples generally exhibited lower hardness and moduli when compared to the crystalline and “mixed” phase samples. This work highlights how sputtering can be used to control individual elements within CCA families in order to examine how their atomic characteristics contribute to phase formation and crystallinity.