1. bookVolume 4 (2021): Issue 1 (April 2021)
Journal Details
License
Format
Journal
First Published
30 Jan 2019
Publication timeframe
2 times per year
Languages
English
access type Open Access

The formation and stability of bulk amorphous and high entropy alloys

Published Online: 08 Jul 2021
Page range: 51 - 57
Journal Details
License
Format
Journal
First Published
30 Jan 2019
Publication timeframe
2 times per year
Languages
English
Abstract

Two kinds of phase stabilization mechanism are discussed and compared: the first is characteristic of the formation of bulk amorphous alloys, in which the high supercooling ability of multicomponent liquids is responsible for the glassy phase stabilization. Here the hindered nucleation of crystalline phases is the center phenomenon. The origin of this hindering is the slowing atomic mobility in the supercooling melt. In contrast the melt supercooling is negligible during the high entropy alloy formation. It is believed that stability of the crystalline single fcc phase is the consequence of the characteristic of high configurational entropy at high temperatures. However, the significance of this entropy-dominated stabilization is overestimated in several references. It has been concluded that transition metal contraction (arising from the d electron participation in the overall bonding state) does also contribute to the high temperature stability of fcc single phase in the high entropy alloys.

Keywords

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