Stress-Enhanced Grain Growth in a Nanostructured Aluminium Alloy During Spark Plasma Sintering

Author

Dongming Liu
Haiming Wen, Missouri University of Science and TechnologyFollow
Dalong Zhang
Chuanxin Wang
Yaojun Lin
Yuhong Xiong
Troy D. Topping
Julie M. Schoenung
Enrique J. Lavernia

Abstract

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.

Recommended Citation

D. Liu et al., "Stress-Enhanced Grain Growth in a Nanostructured Aluminium Alloy During Spark Plasma Sintering," Philosophical Magazine Letters, vol. 94, no. 11, pp. 741 - 748, Taylor & Francis, Nov 2014.

The definitive version is available at https://doi.org/10.1080/09500839.2014.975295

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

0950-0839

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 Taylor & Francis, All rights reserved.

Publication Date

01 Nov 2014