Acta Metallurgica Sinica (English Letters) ›› 2020, Vol. 33 ›› Issue (8): 1064-1076.DOI: 10.1007/s40195-020-01040-0

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Designing Rules of Laser-Clad High-Entropy Alloy Coatings with Simple Solid Solution Phases

Yongfei Juan1, Jiao Zhang1(), Yongbing Dai1, Qing Dong1, Yanfeng Han1   

  1. 1Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai, 200240, China
  • Received:2019-10-29 Revised:2019-12-10 Online:2020-08-10 Published:2020-08-06
  • Contact: Jiao Zhang

Abstract:

The criteria of process parameters (μ ≤ 4), atomic size difference (ε ≤ 5.8, δ ≤ 11 and α ≤ 2), thermodynamic (- 14.5 ≤ ∆Hmix ≤ 6.5 and Ω ≥ 1.8) in the prediction of the phase stability for laser-clad high-entropy alloy coatings are studied in detail. Besides, the criteria of valence electron concentration (VEC) applied to distinguish the stability of different solid solution phases are as follows: VEC < 7.65 for simple BCC, VEC ≥ 7.65 for simple face-centered cubic (FCC), 7.14 < VEC < 7.78 for dual-phase BCC and FCC. Among them, μ and ε proposed firstly separate the phase stability of laser-clad high-entropy alloy coatings quite precisely. The other modified criteria (δ, α, ∆Hmix, Ω, VEC) are proved to be different from those of the high-entropy alloys synthesized by the traditional casting and smelting processes.

Key words: High-entropy alloys, Laser cladding, Phase stability, Criteria