Effects of hot compression deformation temperature on the microstructure and properties of Al–Zr–La alloys

• Published in: International journal of minerals, metallurgy and materials metallurgy and materials, 2018-02, Vol.25 (2), p.236-243
• Main Authors: Yue, Xian-hua, Liu, Chun-fang, Liu, Hui-hua, Xiao, Su-fen, Tang, Zheng-hua, Tang, Tian
• Format: Article
• Language: English
• Subjects: Alloys; Aluminum alloys; Aluminum base alloys; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Compression tests; Corrosion and Coatings; Deformation; Deformation effects; Dislocation density; Dynamic recrystallization; Electrical properties; Electrical resistivity; Experiments; Glass; Grain boundary sliding; Grain size; Heat resistance; Hot pressing; Materials Science; Metallic Materials; Microscopy; Microstructure; Natural Materials; Precipitates; Surfaces and Interfaces; Temperature; Thermal simulation; Thermal simulators; Thin Films; Tribology; Yield strength; Zirconium; 微观结构; 热压缩; 温度; 合金; 性质; 再结晶行为; 通行证; 流动压力
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-018-1566-y

The main goal of this study is to investigate the microstructure and electrical properties of Al–Zr–La alloys under different hot compression deformation temperatures. In particular, a Gleeble 3500 thermal simulator was used to carry out multi-pass hot compression tests. For five-pass hot compression deformation, the last-pass deformation temperatures were 240, 260, 300, 340, 380, and 420°C, respectively, where the first-pass deformation temperature was 460°C. The experimental results indicated that increasing the hot compression deformation temperature with each pass resulted in improved electrical conductivity of the alloy. Consequently, the flow stress was reduced after deformation of the samples subjected to the same number of passes. In addition, the dislocation density gradually decreased and the grain size increased after hot compression deformation. Furthermore, the dynamic recrystallization behavior was effectively suppressed during the hot compression process because spherical Al_3Zr precipitates pinned the dislocation movement effectively and prevented grain boundary sliding.