Vacancy formation enthalpy in CoCrFeMnNi high-entropy alloy. (February 2020)

• Record Type: Journal Article
• Authors: Sugita, Kazuki; Matsuoka, Naoki; Mizuno, Masataka; Araki, Hideki
• Is Part Of: Scripta materialia. Number 176(2020)
• Page Start: 32
• Page End: 35
• Publication Date: 2020-02
• Subjects: High entropy alloy -- Vacancy formation enthalpy -- Positron lifetime; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.09.033
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract : In order to determine the vacancy formation enthalpy in a CoCrFeMnNi high entropy alloy, we have performed positron lifetime measurements over a temperature range from 293 to 1423 K. A vacancy formation enthalpy of 1.69 ± 0.13 eV was obtained using a threshold method, similar to the value of 1.72 ± 0.18 eV obtained using an Arrhenius plot. The vacancy formation energies are within the formation enthalpy ranges of the constituent pure metals. The vacancy diffusion activation energy of 2.78 ± 0.08 eV is in excellent agreement with the self-diffusion activation energies reported for the constituent face-centered cubic metals.