Effects of pre-deformation on grain refinement and superplasticity of 2050 Al-Li alloy
YE Ling-ying1,2,3, SUN Quan1,2,3, LI Hong-ping1,2,3, LIU Sheng-dan1,2,3, ZHANG Xin-ming1,2,3
1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering(Ministry of Education), Central South University, Changsha 410083, China;
3. Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha 410083, China
Abstract：Fine-grain 2050 Al-Li alloy sheets were prepared by thermomechanical treatment processing(TMTP). The effects of pre-deformation on second phase distribution, grain structure and superpl-asticity of alloy sheets were studied by optical microscope and scanning electron microscope. The results show that after pre-deformation, a large amount of subgrains are formed in the plate during high temperature overaging. A large number of subgrain boundaries promote the precipitation of TB phase and increase the roughening rate, which significantly increases the size of intragranular TB phase. The volume fraction of second phase particles that effectively stimulates recrystallization nucleation increases from 0.92% to 3.28%. Compared with the non-predeformed sheets, the average grain size of the center layer of the sheets is reduced from 12.59μm to 9.59μm, the average grain size of the surface layer is reduced from 10.79μm to 8.60μm, the grain refinement effect is obviously improved, the superplastic deformation ability is significantly improved. The elongation of superpla-stic deformation increases from 230% to 470% under the condition of 490℃ and 2×10-4s-1.
叶凌英, 孙泉, 李红萍, 刘胜胆, 张新明. 预变形对2050铝锂合金晶粒细化及超塑性的影响[J]. 材料工程, 2019, 47(12): 92-97.
YE Ling-ying, SUN Quan, LI Hong-ping, LIU Sheng-dan, ZHANG Xin-ming. Effects of pre-deformation on grain refinement and superplasticity of 2050 Al-Li alloy. Journal of Materials Engineering, 2019, 47(12): 92-97.
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2019, Vol. 47 
