QiQiang Duan

Chinese Academy of Sciences

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B.S. Gong

Chinese Academy of Sciences

Zhenjun Zhang

Chinese Academy of Sciences

Fuguan Cong

Northeastern University

ZheFeng Zhang

Chinese Academy of Sciences

HanZhong Liu

Chinese Academy of Sciences

Xuegang Wang

University of Electronic Science and Technology of China

Jiapeng Hou

Chinese Academy of Sciences

Zhan Qu

Chinese Academy of Sciences

Ronghua Li

Northwest A&F University

Gencay Purcek

Karadeniz Technical University

Cooperative Institutions

Chinese Academy of Sciences

University of Science and Technology of China

Nanjing University

University of Electronic Science and Technology of China

Institute of Modern Physics

Northeastern University

Karadeniz Technical University

Xi'an Jiaotong University

University of Chinese Academy of Sciences

Suzhou Institute of Nano-tech and Nano-bionics

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Effect of Aging on Impact Toughness and Fracture Behavior of Three Wrought Aluminum Alloys

Advanced Engineering Materials (2023)

B.S. Gong Zhenjun Zhang QiQiang Duan Jiapeng Hou Ronghua Li

Herein, the effect of the aging state on the impact toughness of three typical wrought Al alloys (7075, 2024, and 6A01) is investigated. At room temperature, the fracture mode of the three aluminum alloys at different aging states is a ductile transgranular fracture. At low temperatures, high‐strength aluminum alloys exhibit a mixture fracture of transgranular and intergranular, while medium‐strength aluminum alloys are still dominated by transgranular fractures. The effect of the aging state on the impact toughness of aluminum alloys was analyzed based on the deformation mechanism and morphology near grain boundaries. The underaged state with planar slip dislocations exhibits good plasticity and work‐hardening ability, which reduces the strain localization caused by dislocation plugging and thus improves the impact toughness of the alloy. Furthermore, the fine grain boundary precipitates and the narrow precipitation‐free zone of the underaged increase the uniform deformation capacity near the grain boundaries and inhibit the initiation and propagation of cracks. Compared with high‐strength aluminum alloys, medium‐strength aluminum alloys exhibit higher impact toughness due to the formation of a larger plastic zone and shear lip area during impact.

Transgranular fracture

Precipitation hardening

10.1002/adem.202300033

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Effects of the aging state and tensile strength on the fatigue properties of 6A01 aluminum alloy

Authorea (Authorea) (2021)

B.S. Gong Zhenjun Zhang QiQiang Duan Zhan Qu Peng Zhang

Abstract To study the effects of the aging state and tensile strength on the fatigue properties of 6A01 Al alloy, the high-cycle fatigue (HCF) experiments were carried out for different aging states. The results show that the 6A01 Al alloy with the highest tensile strength at peak-aging state can exhibit the highest fatigue strength in comparison with the overaged state and the underaged state. The main reason is that the increased strength of the 6A01 Al alloy at peak-aging state can improve the plastic deformation resistance and inhibit the fatigue crack initiation. Besides, the intermittent distribution of grain boundary precipitates at the peak-aging state is beneficial for reducing the fatigue damage. From these results, it is verified that the tensile strength plays a key role in the fatigue strength relative to the aging state for the low-strength Al alloys.

Fatigue limit

10.22541/au.162148562.20583311/v1

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Comparison on the Fatigue Crack Propagation of High‐Strength Aluminum Alloys

Advanced Engineering Materials (2023)

B.S. Gong Zhenjun Zhang QiQiang Duan Hongwei Wang Xuegang Wang

To investigate the fatigue crack propagation (FCP) behaviors of high‐strength 7075 and 2024 Al alloys, FCP experiments are conducted for the two alloys at different aging states (underaged [UA], peak aging, and overaged). It is found that strength and plasticity are the main factors influencing the FCP. For 7075 Al alloy, the FCP curves almost coincide for the three aging states that have similar tensile properties. However, 2024 Al alloy shows the lowest FCP rate at the UA state which has the strongest strength–plasticity match among the three aging stages. Based on the low‐cycle‐fatigue damage model, the effect of strength–plasticity balance on FCP rate of the two Al alloys at different aging states is quantitatively analyzed. It is found that the larger the strength–plasticity balance of the alloy, the smaller the FCP rate under the same stress intensity factor. This study indicates that the FCP rate of high‐strength Al alloys is mainly influenced by the strength–plasticity balance due to the difference in the aging states.

Fatigue limit

10.1002/adem.202301083

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