Solid state amorphization of metastable Al0.5TiZrPdCuNi high entropy alloy investigated by high voltage electron microscopy

Nagase, Takeshi; Takeuchi, Akira; Amiya, Kenji; Egami, Takeshi

doi:10.1016/j.matchemphys.2017.07.071

Title: Solid state amorphization of metastable Al_0.5TiZrPdCuNi high entropy alloy investigated by high voltage electron microscopy

Journal Article · Tue Jul 18 00:00:00 EDT 2017 · Materials Chemistry and Physics

DOI:https://doi.org/10.1016/j.matchemphys.2017.07.071· OSTI ID:1454411

Nagase, Takeshi ^[1]; Takeuchi, Akira ^[2]; Amiya, Kenji ^[2]; Egami, Takeshi ^[3]

Osaka Univ., Osaka (Japan)
Tohoku Univ., Sendai (Japan)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, the phase stability of high entropy alloy (HEA), Al_0.5TiZrPdCuNi, under fast electron irradiation was studied by in-situ high voltage electron microscopy (HVEM). The initial phase of this alloy quenched from the melt was dependent on cooling rate. At high cooling rates an amorphous phase was obtained, whereas a body-centered cubic (b.c.c.) phase were obtained at low cooling rates. By thermal crystallization of the amorphous phase b.c.c. phase nano-crystals were formed. Upon fast electron irradiation solid state amorphization (SSA) was observed in b.c.c. phase regardless of the initial microstructure (i.e., “coarse crystalline structure” or “nano-crystalline structure with grain boundaries as a sink for point defects”). SSA behavior in the Al_0.5TiZrPdCuNi HEAs was investigated by in-situ transmission electron microscopy observations. Because the amorphization is very rarely achieved in a solid solution phase under fast electron irradiation in common metallic materials, this result suggests that the Al_0.5TiZrPdCuNi HEA from other common alloys and the other HEAs. The differences in phase stability against the irradiation between the Al_0.5TiZrPdCuNi HEA and the other HEAs were discussed. This is the first experimental evidence of SSA in HEAs stimulated by fast electron irradiation.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1454411

Journal Information:: Materials Chemistry and Physics, Vol. 210, Issue C; ISSN 0254-0584

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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Electronic structure and atomic level complexity in Al _0.5 TiZrPdCuNi high-entropy alloy in glass phase Odbadrakh, Kh.; Enkhtor, L.; Amartaivan, Ts. Journal of Applied Physics, Vol. 126, Issue 9 https://doi.org/10.1063/1.5110519	journal	September 2019
Compositional Design of Soft Magnetic High Entropy Alloys by Minimizing Magnetostriction Coefficient in (Fe0.3Co0.5Ni0.2)100−x(Al1/3Si2/3)x System Zhang, Yong; Zhang, Min; Li, Dongyue Metals, Vol. 9, Issue 3 https://doi.org/10.3390/met9030382	journal	March 2019
Transition from high-entropy to Cu-based (TiZrNbNi) _{1− x} Cu _x metallic glasses Ristić, Ramir; Figueroa, Ignacio A.; Lachová, Andrea Journal of Applied Physics, Vol. 126, Issue 15 https://doi.org/10.1063/1.5119373	journal	October 2019

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