Stress-enhanced grain growth in a nanostructured aluminium alloy during spark plasma sintering

Dongming Liu; Haiming Wen; Dalong Zhang; Chuanxin Wang; Yaojun Lin; Yuhong Xiong; Troy Topping; Julie M Schoenung; Enrique J Lavernia

doi:10.1080/09500839.2014.975295

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Stress-enhanced grain growth in a nanostructured aluminium alloy during spark plasma sintering

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Stress-enhanced grain growth in a nanostructured aluminium alloy during spark plasma sintering

Dongming Liu, Haiming Wen, Dalong Zhang, Chuanxin Wang, Yaojun Lin, Yuhong Xiong, Troy Topping, Julie M Schoenung and Enrique J Lavernia

Philosophical magazine letters, Vol.94(11), pp.741-748

11/02/2014

DOI: https://doi.org/10.1080/09500839.2014.975295

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https://hdl.handle.net/20.500.12741/rep:5856

Abstract

aluminium alloy

grain growth mechanism

spark plasma sintering

high pressure

nanostructured materials

In this study, we report on the influence of high pressure on the microstructure evolution of cryomilled nanostructured Al alloy powders during spark plasma sintering (SPS). Our experimental results suggest that the particular mechanism that governs grain growth during SPS depends on the magnitude of the applied pressure. In the case of material consolidated at a high pressure (e.g. 500 MPa), grain coarsening occurs via a combination of thermally activated grain boundary (GB) migration, stress-coupled GB migration and grain rotation-induced grain coalescence. In contrast, in the case of the material consolidated at a low pressure (50 MPa), grain growth occurs primarily via thermally activated GB migration.

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Title: Stress-enhanced grain growth in a nanostructured aluminium alloy during spark plasma sintering
Creators: Dongming Liu - Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University
Haiming Wen - Department of Chemical Engineering and Materials Science, University of California
Dalong Zhang - Department of Chemical Engineering and Materials Science, University of California
Chuanxin Wang - Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University
Yaojun Lin - State Key Laboratory of Metastable Materials Science and Technology and College of Materials Science and Engineering, Yanshan University
Yuhong Xiong - Department of Chemical Engineering and Materials Science, University of California
Troy Topping - Department of Mechanical Engineering, California State University
Julie M Schoenung - Department of Chemical Engineering and Materials Science, University of California
Enrique J Lavernia - Department of Chemical Engineering and Materials Science, University of California
Academic Unit: Mechanical Engineering Department
Publisher: Taylor & Francis
Publication Details: 11/02/2014
Identifiers: 99257847434901671; https://hdl.handle.net/20.500.12741/rep:5856; https://doi.org/10.1080/09500839.2014.975295
Language: English

Stress-enhanced grain growth in a nanostructured aluminium alloy during spark plasma sintering

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