首页|BCC+L21 dual-phase Cu40Al20Ti20V20 near-eutectic high-entropy alloy with a combination of strength and plasticity
BCC+L21 dual-phase Cu40Al20Ti20V20 near-eutectic high-entropy alloy with a combination of strength and plasticity
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NSTL
Elsevier
? 2022 Elsevier B.V.To pursue a combination of strength and plasticity, a near-eutectic high-entropy alloy Cu40Al20Ti20V20 was developed by using a stoichiometric ratio of the L21 Cu2AlTi ordered phase. The results showed that a soft-hard alternating BCC (α)+L21 (β) dual-phase structure was realized. The as-cast alloy was composed of BCC (αp) dendrites, and a lamellar and rod-like BCC+L21 Cu2AlTi (α + β) eutectic structure with a small amount of FCC Cu-rich phase embedded within. Due to the soft-hard dual-phase structure and large number of phase interfaces of the eutectic, the as-cast alloy possessed a high yield strength of 1300 MPa and plasticity of 6.3%. Annealing facilitated the precipitation of a substantial number of L21 nanoparticles (βII) in the dendrites and the diffusion of Cu atoms from the Cu-rich phase to the matrix. The desolation transformation of βII and the Cu diffusion during annealing increased the formation of excess L21 hard-phase to ~50 vol%. Many micro-pores were also formed, which facilitated crack initiation and deteriorated the strength and plasticity of the homogenized alloy.
Niu H.、Yang L.、Wang J.、Xu M.、Yi J.、Yang G.、Wang L.
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School of Materials Engineering Jiangsu University of Technology
Laboratory of Advanced Multicomponent Materials School of Mechanical Engineering Jiangsu University of Technology
Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion School of Materials Science and Engineering Hunan University of Science and Technology
NSTL
Elsevier
