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Materials 2018, 11(7), 1158; https://doi.org/10.3390/ma11071158

Evolution of Elevated-Temperature Strength and Creep Resistance during Multi-Step Heat Treatments in Al-Mn-Mg Alloy

1,2
,
3,* and 1,2
1
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China
2
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
3
Department of Applied Science, University of Quebec at Chicoutimi, Saguenay, QC G7H 2B1, Canada
*
Author to whom correspondence should be addressed.
Received: 4 June 2018 / Revised: 2 July 2018 / Accepted: 3 July 2018 / Published: 7 July 2018
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

The present work has systematically investigated the evolution of dispersoids and elevated-temperature properties including strength and creep resistance during various multi-step heat treatments in Al-Mn-Mg 3004 alloys. Results show that only the α-Al(MnFe)Si dispersoid is observed in the studied temperature range (up to 625 °C), and that it coarsens with increasing temperature to 500 °C, but dissolves at 625 °C. The evolution of elevated-temperature strength and creep resistance is greatly related to the temperature of each step during the multi-step heat treatments. Generally, lower temperature at the first-step heat treatment leads to higher properties, while the properties decrease with increasing temperature of last-step heat treatment. Suitable models have been introduced to explain the evolution of strength and the creep threshold stress at elevated-temperatures during the various heat treatments. View Full-Text
Keywords: Al-Mn-Mg alloy; dispersoids; heat treatment; elevated temperature; strength; creep resistance Al-Mn-Mg alloy; dispersoids; heat treatment; elevated temperature; strength; creep resistance
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Wang, G.S.; Liu, K.; Wang, S.L. Evolution of Elevated-Temperature Strength and Creep Resistance during Multi-Step Heat Treatments in Al-Mn-Mg Alloy. Materials 2018, 11, 1158.

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