摘要
采用形变热处理法制备01420铝锂合金细晶板材,研究轧制预热时间对第二相粗化、回溶及最终再结晶组织的影响。研究结果表明:合金在300℃/48 h过时效处理过程中析出大量棒状的微米尺寸S相,这些第二相在随后的轧制前400℃预热过程中不稳定,首先粗化成球形相,当预热时间超过8 h,又开始逐渐地溶解;在400℃预热0～10 h内,第二相分布比较均匀;当预热时间超过12 h,没有溶解的第二相主要分布于晶界处,尺寸较小,是导致最终再结晶组织粗大且呈扁平状的主要原因;随着预热时间的延长,板材轧制和再结晶后的晶粒尺寸逐渐增大,但在预热8 h内增幅较小。板材适宜的轧制预热制度为于400℃预热4～8 h。
Fine grained 01420 Al-Li alloy sheet was produced by thermo-mechanical processing.The effects of pre-heating time on precipitate coarsening,dissolution and grain structure were investigated.The results show that a large number of micron-sized,rod-shaped S-phase particles are produced during overaging at 300 ℃ for 48 h.However,these particles are not stable during the following pre-heating at 400 ℃ and they tend to be coarsened to globular particles firstly and then start to dissolve after preheated for more than 8 h.The particles are distributed homogeneously when preheated at 400 ℃ for 0-10 h,but the remained particles are mainly located at grain boundaries when pre-heating duration is over 12 h.This is the main reason of causing the coarse and elongated grain structure.The grain size increases with the increasing preheating time but grows a little in 8 h.The proper pre-heating schedule is at 400 ℃ for 4-8 h.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第1期87-92,共6页
Journal of Central South University:Science and Technology
基金
国际科技合作重点资助项目(2008DFR50260)
中南大学自由探索计划资助(2011QNZT004)
关键词
01420铝锂合金
形变热处理
第二相
粒子激发形核
再结晶
001420 Al-Li alloy
thermo-mechanical processing
second phase particle
particle stimulated nucleation（PSN）
recrystallization
