Sarswat Prashant, Smith Taylor, Sarkar Sayan, Murali Arun, Free Michael
Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT 84112, USA.
Materials (Basel). 2020 Jul 6;13(13):3001. doi: 10.3390/ma13133001.
High entropy alloys (HEAs) were prepared using the powder bed fusion (PBF) technique. Among titanium free alloys AlCoCrFeNiMn, CoCrFeMnNi, AlCoCrFeNi, and AlCoCrFeNi have been further investigated. A cost comparison was done for these four alloys as well as the titanium-based alloys AlCoCrFeNiTi and AlCoCrFeNiTi. Such a comparison was done in order to evaluate the performance of the titanium-free alloys as the estimated cost of these will be less than for Ti-based HEAs. Hence, we have chosen four titanium free alloys and two titanium-based alloys for further processing. All these alloys were fabricated and subsequently characterized for phase, purity and performance. Scanning electron microscopy-based images were captured for microstructure characterization. EIS-based tests and potentiodynamic scans were performed to evaluate corrosion current. Hardness tests were performed for mechanical properties evaluation. Additional testing using factorial design tests was performed to evaluate the effects of various parameters to create better PBF-based HEA samples. EBSD tests, accelerated corrosion tests (mass loss), chemical analysis after degradation, microstructure analysis before and after degradation, and mechanical property comparison for finalized samples and other similar tests were executed. The details about all these HEAs and subsequent laser processing as well as behavior of these HEAs have been included in this study. It has been observed that some of the selected alloys exhibit good performance compared to Ti-based alloys, especially with respect to improvements in elastic constant and hardness relative to commercially pure Ti.
采用粉末床熔融（PBF）技术制备了高熵合金（HEA）。在无钛合金中，对AlCoCrFeNiMn、CoCrFeMnNi、AlCoCrFeNi和AlCoCrFeNi进行了进一步研究。对这四种合金以及钛基合金AlCoCrFeNiTi和AlCoCrFeNiTi进行了成本比较。进行这样的比较是为了评估无钛合金的性能，因为预计这些合金的成本将低于钛基高熵合金。因此，我们选择了四种无钛合金和两种钛基合金进行进一步加工。所有这些合金都进行了制备，并随后对其相、纯度和性能进行了表征。拍摄了基于扫描电子显微镜的图像用于微观结构表征。进行了基于电化学阻抗谱（EIS）的测试和动电位扫描以评估腐蚀电流。进行硬度测试以评估力学性能。使用析因设计测试进行了额外测试，以评估各种参数对制备更好的基于PBF的高熵合金样品的影响。进行了电子背散射衍射（EBSD）测试、加速腐蚀测试（质量损失）、降解后的化学分析、降解前后的微观结构分析以及最终样品的力学性能比较和其他类似测试。本研究包含了所有这些高熵合金及其后续激光加工的详细信息以及这些高熵合金的性能表现。据观察，与钛基合金相比，一些选定的合金表现出良好的性能，特别是在弹性常数和硬度相对于商业纯钛有所提高方面。
