Homogenization and Recrystallization of Al-6Mg Alloys with and without Sc and Zr

• 作 者: 姜锋 尹志民 黄伯云 贺跃辉 陈苏里
• 机 构: Institute of Materials Science and Engineering, Central South University, Changsha 410083, China, St
• 出 处: Journal of Rare Earths
• 发表日期: 2004年05期

Plates of Al-6Mg alloys with and without scandium were prepared by semi-continuous cast, homogenization, hot-rolled, cold-rolled and annealing. Based on studying of effects of temperature and time on hardness and conductivity during homogenization, it was found that homogenization of ingot with Sc and Zr can result in dispersion strengthening. Recrystallization temperature of alloys was studied by hardness method and optical metallographic method. Staring recrystallization temperature of Al-6Mg alloys with Sc and Zr is 375 ℃, increasing by 150 ℃ than Al-6Mg alloys without Sc and Zr. Mechanical properties (σ_b, σ_(0.2), δ) of hot-rolled alloy with Sc and Zr are 400 MPa, 280 MPa and 18%; cold-rolled and anneal alloy with Sc and Zr are 420 MPa, 310 MPa and 12% respectively.

Based on studying of effects of temperature and time on hardness and conductivity during homogenization, it was found that homogenization of ingot with Sc and Zr can result in dispersion strengthening. Recrystallization temperature of alloys was studied by hardness method and optical metallographic method. Staring recrystallization temperature of Al-6Mg alloys with Sc and Zr is at 375 ° C, increasing by 150 ° C than Al- 6Mg alloys without Sc and Zr. Mechanical properties (σ_b, σ_ (0.2), δ) of hot-rolled alloy with Sc and Zr are 400 MPa, 280 MPa and 18%; cold-rolled and annealed alloys with Sc and Zr are 420 MPa, 310 MPa and 12% respectively.