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Metallurgical and Materials Transactions A

Published in:

14-08-2019

Quench Sensitivity of AA 7136 Alloy: Contribution of Grain Structure and Dispersoids

Authors: Jianguo Tang, Zhenshen Yang, Shengdan Liu, Qing Wang, Jingchao Chen, Wenru Chai, Lingying Ye

Published in: Metallurgical and Materials Transactions A | Issue 10/2019

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Abstract

Quench sensitivity of the extruded AA7136 alloy plate specimens with coarse elongated recrystallized grains (CG), fine equiaxed recrystallized grains (EG), and fibrous partial-recrystallized grains (FG) was investigated with the aim to understand the quantitative contribution of grain structure and dispersoids. With the decrease of quenching rate from about 244 °C/s to 1.3 °C/s, the hardness decrement after aging is about 45, 40, and 30 pct, respectively, for the CG, EG, and FG specimens; therefore, quench sensitivity is the highest for CG specimen, intermediate for EG specimen, and the lowest for FG specimen. There are major quenching-induced η (MgZn₂) phase and minor T (Al₂Zn₃Mg₃) phase in the slowly-quenched CG, EG, and FG specimens, and a plate-like Y phase occasionally appears in subgrains of the FG specimen. The quantitative contribution to quench sensitivity by grain boundaries, subgrain boundaries, and dispersoids in different specimens is discussed based on the amount of quenching-induced precipitates associated with them.

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Title: Quench Sensitivity of AA 7136 Alloy: Contribution of Grain Structure and Dispersoids
Authors: Jianguo Tang
Zhenshen Yang
Shengdan Liu
Qing Wang
Jingchao Chen
Wenru Chai
Lingying Ye
Publication date: 14-08-2019
Publisher: Springer US
Published in: Metallurgical and Materials Transactions A / Issue 10/2019
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI: https://doi.org/10.1007/s11661-019-05397-5

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