Origin of high strength in the CoCrFeNiPd high-entropy alloy

Autor:	Binglun Yin, W. A. Curtin
Jazyk:	angličtina
Rok vydání:	2020
Předmět:	high-entropy alloys palladium solute strengthening theory yield strength Materials of engineering and construction. Mechanics of materials TA401-492
Zdroj:	Materials Research Letters, Vol 8, Iss 6, Pp 209-215 (2020)
Druh dokumentu:	article
ISSN:	2166-3831 21663831
DOI:	10.1080/21663831.2020.1739156
Popis:	Recent experiments show that the CoCrFeNiPd high-entropy alloy (HEA) is significantly stronger than CoCrFeNi and with nanoscale composition fluctuations beyond those expected for random alloys. These fluctuations were suggested to be responsible for strengthening. Here, a recent parameter-free theory for initial yield strength in fcc random alloys is shown to predict the strength of CoCrFeNiPd in good agreement with experiments. The strengthening is due mainly to the large misfit volume of Pd in CoCrFeNi, indicating that effects of the non-random composition fluctuations are secondary. Analyses of strength variations and strengthening-associated length scales helps rationalize why dislocation motion is insensitive to such fluctuations. These findings point to the value of theory for understanding mechanical behavior of HEAs.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/142cb5deadac40a38e7b2f01adb056ca Zobrazit plný text záznamu View record in DOAJ