کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1608633 1516244 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of Mo and Ni elements on microstructure evolution and mechanical properties of the CoFeNixVMoy high entropy alloys
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Effect of Mo and Ni elements on microstructure evolution and mechanical properties of the CoFeNixVMoy high entropy alloys
چکیده انگلیسی


• CoFeNiVMo0.6 and CoFeNi1.4VMo eutectic HEAs were found.
• Mo and Ni elements show the inverse effect on the microstructure evolution.
• The formation condition of the eutectic HEAs was investigated.

A series of CoFeNiVMoy (y = 0–1) and CoFeNixVMo (x = 1–2) high entropy alloys were designed in order to study the effect of Mo and Ni elements on their microstructure evolution and mechanical properties. Results show that for the quinary CoFeNiVMo alloy, by either decreasing the Mo content to 0.6 or increasing the Ni content to 1.4, eutectic microstructures can be obtained. For the CoFeNiVMoy alloys, with increasing Mo content, the volume fraction of the CoMo2Ni-type intermetallic phase increases which results in a decrease of the plastic strain and an increase of the yield strength, and the Vickers hardness shows an approximately linear increase from HV 238.1 to HV 624.6. While for the CoFeNixVMo alloys, with increasing Ni content, the increased FCC solid solution phase leads to an increase of the plastic strain and a decrease of the yield strength. Among these alloys, the CoFeNiVMo0.2 alloy shows the best comprehensive compressive properties: high yield strength of 686.9 MPa and ductility above 80%. In addition, the formation condition of eutectic HEAs was also investigated. It is found that the parameters of valence electron concentration (VEC), atomic size difference (δ), enthalpy of mixing (ΔHmix), entropy of mixing (ΔSmix) and electronegativity (Δχ) cannot effectively design the composition of eutectic HEAs.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 649, 15 November 2015, Pages 585–590
نویسندگان
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