Using ab initio alloy theory, we calculate the impact of Ni on the stacking fault energy in austenitic stainless steel as a function of temperature. We show that the influence of Ni strongly couples with temperature. While a positive effect on the stacking fault energy is obtained at ambient temperature, the opposite negative effect is disclosed at elevated temperatures. An important rationale behind is demonstrated to be the variation of magneto-volume coupling induced by Ni alloying. The alloy influence on the finite temperature evolution of Ni impact is evaluated for elements Cr, Mo and N. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Funding Agencies|Swedish Research CouncilSwedish Research Council [2015-5335, 2017-06474]; Swedish Foundation for Strategic ResearchSwedish Foundation for Strategic Research [S14-0038, SM16-0036]; Swedish Foundation for International Cooperation in Research and Higher Education [CH2015-6292]; Hungarian Scientific Research FundOrszagos Tudomanyos Kutatasi Alapprogramok (OTKA) [OTKA 128229]; Carl Tryggers Foundation