Design and tensile properties of a bcc Ti-rich high-entropy alloy with transformation-induced plasticity

By L. Lilensten, J. Couzinié, J. Bourgon, L. Perrière, G. Dirras, F. Prima, I. Guillot. 2017

244 citations recorded by the source corpus.

ABSTRACT A new bcc Ti-rich high-entropy alloy (HEA) of composition Ti35Zr27.5Hf27.5Nb5Ta5 was designed using the ‘d-electron alloy design’ approach. The tensile behavior displays a marked transformation-induced plasticity effect resulting in a high normalized work-hardening rate of 0.103 without loss of ductility when compared to the reference composition Ti20Zr20Hf20Nb20Ta20. In this paper, a detailed microstructural analysis was performed to understand the deformation process, revealing architectural-type microstructures and a high volume fraction (65%) of internally twinned stress-induced martensite α″ after mechanical testing. This study opens the way to mechanical properties optimization and enhancement of titanium-based HEAs by combining multiple alloying designs. IMPACT STATEMENT For the first time, proof is given that transformation-induced plasticity was triggered in a bcc refractory high-entropy alloy, leading to a twofold increase in the normalized work-hardening rate. GRAPHICAL ABSTRACT

Subfields: Materials Chemistry, Mechanical Engineering, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/3908009c5099b21bde7642c442dba878c373527b

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In Materials Chemistry

In Mechanical Engineering

In Mechanics of Materials

Citations in the corpus

Development and exploration of refractory high entropy alloys—A review (2018, background): “27Zr alloy experienced 7% tensile strain.(86) EBSD inverse pole figure maps of the (a) BCC phase and (b) a0 orthorhombic martensite phase.”