Aging microstructure and mechanical properties of ZA84+Ca-Bi magnesium alloy

作者：Dong Yun^*; Lin Xiaoping; Ye Jie; Zhao Tianbo; Fan Zhibin

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2015, 636: 600-607.

DOI：10.1016/j.msea.2015.04.032

• ZA84+(Bi-Ca) alloy
• Microstructure
• Age hardening
• Spherical precipitates
• Rod-shaped

As-cast microstructure and its properties, aging hardening effect and phase transformation during aging of ZA84+Bi-Ca alloy were investigated using high resolution transmission electron microscopy (HRTEM), and XRD. Results showed that (1) the as-cast microstructure of the ZA84+Bi-Ca alloy was refined by adding Bi-Ca, and the mechanical properties were improved; (2) when the alloy was aged at 160 degrees C, the early strengthening phase was spherical Ca2Mg6Zn3 precipitates; as the aging time increased, blocky beta(1)' and rod-shaped beta(1)' phases gradually precipitated, greatly improving the aging hardness, and the rod-shaped beta(1)' precipitates were the main strengthening phase that made the alloy hardness reach the peak and (3) there was an adhesive phenomenon between the tips of the spherical phase and the rodlike phase during aging, which to some extent inhibited the growth of the rod-shaped beta(1)' precipitates, thus, delaying the aging process.

• 出版日期2015-6-11
• 单位东北大学