A novel dissolution-precipitation mechanism during liquid phase sintering and its strengthening effects in W-Ni-Fe alloys with low W contents

Yong Han; Yuan Li; Lei Ye; Zhiyuan Du; Zhanggen Liu; Xin Li; Ming-Chun Zhao; Andrej Atrens

Materials & Design (Aug 2022)

A novel dissolution-precipitation mechanism during liquid phase sintering and its strengthening effects in W-Ni-Fe alloys with low W contents

Yong Han,
Yuan Li,
Lei Ye,
Zhiyuan Du,
Zhanggen Liu,
Xin Li,
Ming-Chun Zhao,
Andrej Atrens

Affiliations

Yong Han: State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, PR China
Yuan Li: State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, PR China
Lei Ye: State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, PR China
Zhiyuan Du: State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, PR China
Zhanggen Liu: State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, PR China
Xin Li: State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, PR China
Ming-Chun Zhao: State Key Laboratory of Powder Metallurgy, School of Materials Science and Engineering, Central South University, Changsha 410083, PR China; Corresponding author.
Andrej Atrens: School of Mechanical and Mining Engineering, The University of Queensland, Brisbane, Qld 4072, Australia

Journal volume & issue: Vol. 220
p. 110841

Abstract

Read online

W-Ni-Fe alloys with a low W content are a kind of promising tungsten alloys. However, limited results are available, and the responsible mechanism is not known for their dissolution-precipitation behavior, because long-range migration under the low W concentration is difficult after tungsten dissolution. In this work, a tungsten alloy with a low W content was prepared by liquid phase sintering. A new in-situ dissolution-precipitation process for tungsten alloys with a low W content was identified, which is different from that for tungsten alloys with a high W content. The interface between ultrafine precipitated W grains and the γ(FeNi3, W) phase in tungsten alloys with a low W content was a semi-coherent interphase boundary. Ni atoms and Fe atoms in the γ phase lattice were continuously replaced by W atoms during precipitation. W atoms continued to mass transfer to the interface area, and W grains formed when the enrichment was sufficient. The obtained 50W-25Ni-25Fe tungsten alloy had the superior combination of ultimate tensile strength (UTS) and elongation. The precipitation of ultrafine W grain strengthened the alloy.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

About the journal

Abstract

Keywords