Effect of pre-aging on creep aging properties and microstructure evolution of 2195 Al–Li alloy

• DOI: 10.1016/j.jmrt.2022.09.075
• Publication Date: 2022-09-21T15:23:32Z
• Authors: Fei Chen; Jue Zhong; Lihua Zhan; Peng Wang; Xiaopeng Ruan; Huiqiang Wu; Yongqian Xu; Bolin Ma; Chunhui Liu; Quanqing Zeng; Zhenggen Hu; Wenli Zhu
• Keywords: Mining engineering. Metallurgy; Al–Li alloy; 0203 mechanical engineering; Microstructure evolutions; 0103 physical sciences; TN1-997; Mechanical properties; 02 engineering and technology; Pre-aging; Creep aging; 01 natural sciences

Creep aging forming (CAF) is a potential process to manufacture large integral components of Al–Li alloys, which exhibits poor formability and susceptibility damage cracking via traditional plastic processes. alloys also have disadvantages, such as low creep comprehensive properties. To address this problem, study adopted pre-aging treatment before (CA). The effects at different temperatures (65 °C, 90 115 °C) on the CA were evaluated 155 °C for 18 h. strain, evolution mechanical properties, microstructural characteristics investigated well. results showed that could effectively influence subsequent behavior. As temperature increased, strain accumulation during decreased. Meanwhile, significantly increased elongation (EL) specimens after CA; Notably, increase in EL did not compromise strength. Changes microstructure tests observed by transmission electron microscopy. effect properties mainly revealed strength was lower than specimen without same test through adjusting percentage size T 1 θ′ phases. In addition, promote transformation fracture mechanism from intergranular mixed CA.