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Effect of Two-stage Ageing on Mechanical Properties and Sensitivity to Hydrogen Embrittlement of 7050 Aluminum Alloy |
REN Jianping1,SONG Renguo2() |
1. Taizhou Vocational College of Science and Technology, Taizhou 318020, China 2. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China |
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Abstract The effect of two-stage ageing heat treatment on the mechanical performance and sensitivity to hydrogen embrittlement for 7075 Al-alloy was assessed by means of tensile tester, hardness tester and cross section morphology observation, as well as cathodic hydrogen permeability method, hydrogen meter, EDS and SEM. The results show that the double peak phenomenon emerged for the two-stage ageing heat-treated 7050 Al-alloy, and the elongation decreases basically with the ageing process, while the peak positions fluctuate to certain extend. The hydrogen content increases with the extension of hydrogen charging time. From the perspective of the same hydrogen charging time, the hydrogen content is the lowest at the peak of the second ageing, however the alloy presented strong toughness. Scanning electron microscopy (SEM) revealed that the improvement of the second peak strength and hardness is due to the increased amount of η', while the plastic toughness increase is mainly ascribed to that η' phase particles evenly dispersed in the matrix, leading to the uniformity in deformation.
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Received: 03 November 2018
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Fund: Supported by National Natural Science Foundation of China(50771093 and 51371039) |
Corresponding Authors:
Renguo SONG
E-mail: songrg@hotmail.com
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