Investigation on the Quench Sensitivity of 7085 Aluminum Alloy with Different Contents of Main Alloying Elements

Metals

Chengbo Li¹  Dongdong Chen² 

[1] School of Materials Science and Engineering, Central South University, Changsha 410083, China;School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;

关键词: 7085 aluminum alloy;    quench sensitivity;    main alloying elements;    η phase;   

DOI  :  10.3390/met9090965

来源: DOAJ

【 摘 要 】

The quench sensitivity of 7085 aluminum alloy with different contents of the main alloying elements (Zn, Mg and Cu) was investigated using time-temperature-transformation (TTT) curves and end quenching experiments. Then, the quenching microstructure was analyzed using transmission electron microscopy. With increasing the contents of the main alloying elements, the transitions and nose temperatures of the TTT curves are obviously increased, while the incubation time of 0.5% η (MgZn₂) phase precipitation content is decreased. In addition, as the contents of the main alloying elements decrease, the conductivity of the quenched samples is increased, but the hardness of the quenched samples is decreased. Moreover, the size and area fraction of the η phase are increased with increasing the contents of the main alloying elements. Based on the experimental results, the increase of Mg and Cu contents can decrease the stability of supersaturated solid solution and increase the lattice distortion energy, which can increase the quench sensitivity of 7085 aluminum alloy.

【 授权许可】

Unknown