Effect of natural aging on Portevin-Le Chatelier effect of TiB2/7050 aluminum matrix composites

doi:10.13251/j.issn.0254-6051.2024.05.013

Abstract

Abstract: Effect of natural aging time on Portevin-Le Chatelier effect (PLC effect) of TiB₂/7050 aluminum matrix composites was investigated. Firstly, room temperature constant strain rate tensile tests were carried out on the TiB₂/7050 aluminum matrix composites, which was solution treated and water cooled, and then naturally aged for different time. Then the average serration amplitude, fall time, recovery time and critical strain were analyzed to study the influence of natural aging time on PLC effect. Finally, the morphology of the tensile fracture was observed by means of scanning electron microscope. The results show that the natural aging time within 1 h has a little effect on strength of the TiB₂/7050 aluminum matrix composites, but the yield and tensile strengths increase significantly when the natural aging time is more than 1 h. The type of PLC bands evolves with the prolongation of natural aging time from the class B (0-1 h) with jumping nature to the class A (1.5 h) with continuous propagation, and then to the class D (2-4 h) with step propagation characteristics. When the natural aging time exceeds 1 h, the tensile fracture dimples of the TiB₂/7050 aluminum matrix composites become significantly shallower and the size becomes smaller, indicating that the plasticity of the composite decreases with the extension of natural aging time. Therefore, the interval between solution treatment and artificial aging of the TiB₂/7050 aluminum matrix composite should not beyond 1 h.

Key words: TiB₂/7050 aluminum matrix composites, natural aging, Portevin-Le Chatelier effect, fracture morphology

CLC Number:

TG156.1

Shang Hongshuai, Han Wenfeng, Jie Zhaocai, Yuan Binxian. Effect of natural aging on Portevin-Le Chatelier effect of TiB₂/7050 aluminum matrix composites[J]. Heat Treatment of Metals, 2024, 49(5): 81-87.

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Effect of natural aging on Portevin-Le Chatelier effect of TiB₂/7050 aluminum matrix composites

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