汽车用2024-T351铝合金的动态力学行为各向异性

doi:10.11896/cldb.22080196

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Abstract The dynamic mechanical behavior and microstructure evolution of the 2024-T351 aluminum alloy used in automobiles were investigated using a tensile testing machine, scanning electron microscope (SEM), and optical microscope (OM). The results showed that the 2024-T351 aluminum alloy exhibited significant anisotropy, and the strain rate had a certain influence on the mechanical properties and microstructure. Under the same strain rate, the stress was highest in the 0° direction and lowest in the 45° direction. In the 0° direction, the ultimate tensile strength of the alloy changed relatively little with increasing strain rate, while the yield strength, elongation, and reduction of area showed a trend of increa-sing first, then remaining constant, and finally increasing continuously. In the 45° and 90° directions, the ultimate tensile strength, yield strength, elongation, and reduction of area all showed a trend of increasing first, then remaining constant, and finally increasing continuously with increa-sing strain rate. The 90° direction had a stronger strain rate sensitivity than the other two directions. Johnson-Cook constitutive equations were fitted for the alloy in the three directions, which could well predict the dynamic mechanical behavior of the 2024-T351 aluminum alloy in various directions. All specimen fracture surfaces had variable-sized dimples, and the dimples formed at higher strain rates were larger and deeper. The grain size after fracture was basically unrelated to the direction and strain rate, but the aspect ratio of the grains was greatly influenced by the direction and strain rate.

Key words： aluminum alloy dynamic mechanical behavior anisotropy microstructure Johnson-Cook constitutive model

Published: 25 April 2024 Online: 2024-04-28

CLC number:

TG146.21

Fund:Ningbo Science and Technology Innovation 2025 Major Special Project (2021Z099,2023Z005), Ningbo Municipal Public Welfare Research Plan Project (202003N4171, 202002N3133), and the State Key Laboratory of New Metal Materials Open Fund (2023-Z04).

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	ZUO Zhidong
	LIU Xianbin
	LIU Jibo
	WANG Xiaofeng
	CHEN Jianbin

Cite this article:

ZUO Zhidong,LIU Xianbin,LIU Jibo, et al. Anisotropy of Dynamic Mechanical Behavior of 2024-T351 Aluminum Alloy for Automobile[J]. Materials Reports, 2024, 38(8): 22080196-9.

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https://www.mater-rep.com/EN/10.11896/cldb.22080196 OR https://www.mater-rep.com/EN/Y2024/V38/I8/22080196

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