Achieving fine-grain tungsten heavy alloys by selecting a high entropy alloy matrix with low W grain growth rate

Ruizhi Jian; Lu Wang; Shangcheng Zhou; Yichao Zhu; Yao Jian Liang; Benpeng Wang; Yunfei Xue

doi:10.1016/j.matlet.2020.128405

Achieving fine-grain tungsten heavy alloys by selecting a high entropy alloy matrix with low W grain growth rate

Ruizhi Jian, Lu Wang, Shangcheng Zhou, Yichao Zhu, Yao Jian Liang, Benpeng Wang, Yunfei Xue^*

^*Corresponding author for this work

School of Material Science and Engineering

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

It is difficult to prepare fine-grain tungsten heavy alloys (WHAs), e.g. W-NiFe, by liquid phase sintering (LPS) mainly because of high solubility of W in the NiFe matrix. To obtain fine W grains, this work proposes to reduce W grain growth rate by selecting a high entropy alloy (HEA) with low diffusivity and solubility of W as the matrix of WHA. The results show that the LPS W-HEA has a fine W grain size of ~9.7 μm, which is about a third of the value in the conventional LPS W-NiFe. The fine W grains in the as-sintering W-HEA contribute to high yield strength and ultimate tensile strength of 840.8 MPa and 1267.3 MPa, respectively. These results suggest a new pathway for obtaining a fine-grain WHA by tailoring the matrix composition.

Original language	English
Article number	128405
Journal	Materials Letters
Volume	278
DOIs	https://doi.org/10.1016/j.matlet.2020.128405
Publication status	Published - 1 Nov 2020

Keywords

Diffusion
Fine grain
High entropy alloys
Sintering
Tungsten heavy alloys

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10.1016/j.matlet.2020.128405

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title = "Achieving fine-grain tungsten heavy alloys by selecting a high entropy alloy matrix with low W grain growth rate",

abstract = "It is difficult to prepare fine-grain tungsten heavy alloys (WHAs), e.g. W-NiFe, by liquid phase sintering (LPS) mainly because of high solubility of W in the NiFe matrix. To obtain fine W grains, this work proposes to reduce W grain growth rate by selecting a high entropy alloy (HEA) with low diffusivity and solubility of W as the matrix of WHA. The results show that the LPS W-HEA has a fine W grain size of ~9.7 μm, which is about a third of the value in the conventional LPS W-NiFe. The fine W grains in the as-sintering W-HEA contribute to high yield strength and ultimate tensile strength of 840.8 MPa and 1267.3 MPa, respectively. These results suggest a new pathway for obtaining a fine-grain WHA by tailoring the matrix composition.",

keywords = "Diffusion, Fine grain, High entropy alloys, Sintering, Tungsten heavy alloys",

author = "Ruizhi Jian and Lu Wang and Shangcheng Zhou and Yichao Zhu and Liang, {Yao Jian} and Benpeng Wang and Yunfei Xue",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2020",

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doi = "10.1016/j.matlet.2020.128405",

language = "English",

volume = "278",

journal = "Materials Letters",

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T1 - Achieving fine-grain tungsten heavy alloys by selecting a high entropy alloy matrix with low W grain growth rate

AU - Jian, Ruizhi

AU - Wang, Lu

AU - Zhou, Shangcheng

AU - Zhu, Yichao

AU - Liang, Yao Jian

AU - Wang, Benpeng

AU - Xue, Yunfei

PY - 2020/11/1

Y1 - 2020/11/1

N2 - It is difficult to prepare fine-grain tungsten heavy alloys (WHAs), e.g. W-NiFe, by liquid phase sintering (LPS) mainly because of high solubility of W in the NiFe matrix. To obtain fine W grains, this work proposes to reduce W grain growth rate by selecting a high entropy alloy (HEA) with low diffusivity and solubility of W as the matrix of WHA. The results show that the LPS W-HEA has a fine W grain size of ~9.7 μm, which is about a third of the value in the conventional LPS W-NiFe. The fine W grains in the as-sintering W-HEA contribute to high yield strength and ultimate tensile strength of 840.8 MPa and 1267.3 MPa, respectively. These results suggest a new pathway for obtaining a fine-grain WHA by tailoring the matrix composition.

AB - It is difficult to prepare fine-grain tungsten heavy alloys (WHAs), e.g. W-NiFe, by liquid phase sintering (LPS) mainly because of high solubility of W in the NiFe matrix. To obtain fine W grains, this work proposes to reduce W grain growth rate by selecting a high entropy alloy (HEA) with low diffusivity and solubility of W as the matrix of WHA. The results show that the LPS W-HEA has a fine W grain size of ~9.7 μm, which is about a third of the value in the conventional LPS W-NiFe. The fine W grains in the as-sintering W-HEA contribute to high yield strength and ultimate tensile strength of 840.8 MPa and 1267.3 MPa, respectively. These results suggest a new pathway for obtaining a fine-grain WHA by tailoring the matrix composition.

KW - Diffusion

KW - Fine grain

KW - High entropy alloys

KW - Sintering

KW - Tungsten heavy alloys

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DO - 10.1016/j.matlet.2020.128405

M3 - Article

AN - SCOPUS:85089016248

SN - 0167-577X

VL - 278

JO - Materials Letters

JF - Materials Letters

M1 - 128405

ER -

Achieving fine-grain tungsten heavy alloys by selecting a high entropy alloy matrix with low W grain growth rate

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Keywords

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