The BCC/B2 morphologies in AlxNiCoFeCr high-entropy alloys

Ma, Yue; Jiang, Beibei; Li, Chunling; Wang, Qing; Dong, Chuang; Liaw, Peter K.; Xu, Fen; Sun, Lixian

doi:10.3390/met7020057

The BCC/B2 morphologies in Al_xNiCoFeCr high-entropy alloys

Journal Article · Tue Feb 14 23:00:00 EST 2017 · Metals

DOI:https://doi.org/10.3390/met7020057· OSTI ID:1356091

Ma, Yue ^[1]; Jiang, Beibei ^[2]; Li, Chunling ^[2]; Wang, Qing ^[2]; Dong, Chuang ^[2]; Liaw, Peter K. ^[3]; Xu, Fen ^[4]; Sun, Lixian ^[4]

Dalian Univ. of Technology, Dalian (China); DOE/OSTI
Dalian Univ. of Technology, Dalian (China)
The Univ. of Tennessee, Knoxville, TN (United States)
Guilin Univ. of Electronic Technology, Guilin (China)

Here, the present work primarily investigates the morphological evolution of the body-centered-cubic (BCC)/B2 phases in Al_xNiCoFeCr high-entropy alloys (HEAs) with increasing Al content. It is found that the BCC/B2 coherent morphology is closely related to the lattice misfit between these two phases, which is sensitive to Al. There are two types of microscopic BCC/B2 morphologies in this HEA series: one is the weave-like morphology induced by the spinodal decomposition, and the other is the microstructure of a spherical disordered BCC precipitation on the ordered B2 matrix that appears in HEAs with a much higher Al content. The mechanical properties, including the compressive yielding strength and microhardness of the Al_xNiCoFeCr HEAs, are also discussed in light of the concept of the valence electron concentration (VEC).

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FE0008855

OSTI ID:: 1356091

Alternate ID(s):: OSTI ID: 1362287

Journal Information:: Metals, Journal Name: Metals Journal Issue: 2 Vol. 7; ISSN MBSEC7; ISSN 2075-4701

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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