NDLI: The Deformation Behavior and Microstructure Evolution of a Mn- and Cr-Containing Al-Mg-Si-Cu Alloy During Hot Compression and Subsequent Heat Treatment

Content Provider	Springer Nature Link
Author	Xu, Yi Nagaumi, Hiromi Han, Yi Zhang, Gongwang Zhai, Tongguang
Copyright Year	2016
Abstract	Hot compression tests on a newly developed Mn- and Cr-containing Al-Mg-Si-Cu alloy were carried out at temperatures ranging from 623 K (350 °C) to 823 K (550 °C) and strain rates between 0.001 and 1 s$^{−1}$ after casting and subsequent homogenization heat treatment. The true stress–true strain curves of the alloy exhibited a peak stress at a small plastic strain followed by dynamic flow softening. Using the constitutive equation containing the strain rate, peak stress, and temperature, the activation energy for hot deformation in the alloy was determined to be 249.67 kJ/mol, much higher than that (143.4 kJ/mol) for self-diffusion in pure Al. Scanning transmission electron microscopy experiments revealed that Mn- and Cr-containing α-dispersoids formed during homogenization showed a strong pinning effect on dislocations and grain boundaries, which was responsible for the increase in activation energy for hot deformation in the alloy. A threshold stress was consequently introduced and determined in the constitutive equation to count for the dispersoid hardening effect on hot deformation in the alloy. Electron back-scatter diffraction measurements revealed that the softening occurred in the alloy was mainly due to dynamic recovery taking place at relatively large Z values, and that it was dominated by continuous dynamic recrystallization at relatively low Z. In subsequent annealing after hot deformation at large Z, abnormal grain growth could occur, as a result of the critical strain-annealing effect. After upsetting at higher temperatures, the alloy showed superior tensile properties due to a high non-recrystallized area fraction.
Starting Page	1355
Ending Page	1365
Page Count	11
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	48
Issue Number	3
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2017-01-03
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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