CAJ | 학술논문

采用Gleeble-1500D热模拟试验机，对35%SiCp/2024A1复合材料在温度350~500°C、应变速率0.01~10 s-1的条件下进行热压缩试验，研究该复合材料的热变形行为与热加工特征，建立热变形本构方程和加工图。结果表明，35%SiCp/2024A1复合材料的流变应力随着温度的升高而降低，随着应变速率的增大而升高，说明该复合材料是正应变速率敏感材料，其热压缩变形时的流变应力可采用 Zener-Hollomon 参数的双曲正弦形式来描述；在本实验条件下平均热变形激活能为225.4 kJ/mol。为了证实其潜在的可加工性，对加工图中的稳定区和失稳区进行标识，并通过微观组织得到验证。综合考虑热加工图和显微组织，得到变形温度500°C、应变速率0.1~1 s-1是复合材料适宜的热变形条件。
채용Gleeble-1500D열모의시험궤，대35%SiCp/2024A1복합재료재온도350~500°C、응변속솔0.01~10 s-1적조건하진행열압축시험，연구해복합재료적열변형행위여열가공특정，건립열변형본구방정화가공도。결과표명，35%SiCp/2024A1복합재료적류변응력수착온도적승고이강저，수착응변속솔적증대이승고，설명해복합재료시정응변속솔민감재료，기열압축변형시적류변응력가채용 Zener-Hollomon 삼수적쌍곡정현형식래묘술；재본실험조건하평균열변형격활능위225.4 kJ/mol。위료증실기잠재적가가공성，대가공도중적은정구화실은구진행표식，병통과미관조직득도험증。종합고필열가공도화현미조직，득도변형온도500°C、응변속솔0.1~1 s-1시복합재료괄의적열변형조건。
The hot deformation behaviors of 35%SiCp/2024 aluminum alloy composites were studied by hot compression tests using Gleeble-1500D thermo-mechanical simulator at temperatures ranging from 350 to 500 °C under strain rates of 0.01-10 s-1. The true stress-true strain curves were obtained in the tests. Constitutive equation and processing map were established. The results show that the flow stress decreases with the increase of deformation temperature at a constant strain rate, and increases with the increase of strain rate at constant temperature, indicating that composite is a positive strain rate sensitive material. The flow stress behavior of composite during hot compression deformation can be represented by a Zener-Hollomon parameter in the hyperbolic sine form. Its activation energy for hot deformation Q is 225.4 kJ/mol. To demonstrate the potential workability, the stable zones and the instability zones in the processing map were identified and verified through micrographs. Considering processing map and microstructure, the hot deformation should be carried out at the temperature of 500 °C and the strain rate of 0.1-1 s-1.