Löbel Martin, Lindner Thomas, Mehner Thomas, Lampke Thomas
Materials and Surface Engineering Group, Institute of Materials Science and Engineering, Chemnitz University of Technology, D-09125 Chemnitz, Germany.
Entropy (Basel). 2018 Jul 2;20(7):505. doi: 10.3390/e20070505.
The novel alloying concept of high-entropy alloys (HEAs) has been the focus of many recent investigations revealing an interesting combination of properties. Alloying with aluminium and titanium showed strong influence on microstructure and phase composition. However, detailed investigations on the influence of titanium are lacking. In this study, the influence of titanium in the alloy system AlCoCrFeNiTi was studied in a wide range (molar ratios x = 0.0; 0.2; 0.5; 0.8; 1.0; 1.5). Detailed studies investigating the microstructure, chemical composition, phase composition, solidification behaviour, and wear behaviour were carried out. Alloying with titanium showed strong influence on the resulting microstructure and lead to an increase of microstructural heterogeneity. Phase analyses revealed the formation of one body-centred cubic (bcc) phase for the alloy without titanium, whereas alloying with titanium caused the formation of two different bcc phases as main phases. Additional phases were detected for alloys with increased titanium content. For x ≥ 0.5, a minor phase with face-centred cubic (fcc) structure was formed. Further addition of titanium led to the formation of complex phases. Investigation of wear behaviour revealed a superior wear resistance of the alloy AlCoCrFeNiTi as compared to a bearing steel sample.
高熵合金（HEAs）的新型合金化概念一直是近期许多研究的重点，这些研究揭示了一系列有趣的性能组合。与铝和钛合金化对微观结构和相组成有显著影响。然而，关于钛的影响的详细研究尚显不足。在本研究中，研究了钛在AlCoCrFeNiTi合金体系中的影响，研究范围广泛（摩尔比x = 0.0；0.2；0.5；0.8；1.0；1.5）。对微观结构、化学成分、相组成、凝固行为和磨损行为进行了详细研究。与钛合金化对所得微观结构有显著影响，并导致微观结构不均匀性增加。相分析表明，不含钛的合金形成了一种体心立方（bcc）相，而与钛合金化则导致形成两种不同的bcc相作为主要相。对于钛含量增加的合金，检测到了额外的相。当x≥0.5时，形成了一种面心立方（fcc）结构的次要相。进一步添加钛导致形成复杂相。磨损行为研究表明，与轴承钢样品相比，AlCoCrFeNiTi合金具有优异的耐磨性。
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