摘要
TA2工业纯钛经过转速180 r/min、行进速度25 mm/min搅拌摩擦加工后发生剧烈塑性变形,获得晶粒尺寸均匀(平均晶粒尺寸为2μm)的细晶组织。在500~600℃对搅拌摩擦加工细晶TA2工业纯钛进行不同时间的退火处理,利用场发射扫描电子显微镜进行组织观察及织构表征,计算晶粒生长指数和激活能,并建立数学模型,系统研究搅拌摩擦加工细晶TA2工业纯钛晶粒长大行为。研究结果表明,搅拌摩擦加工细晶TA2工业纯钛晶粒长大过程中织构具有稳定性,退火处理后晶粒c轴平行于加工方向。当退火温度为550℃时,部分晶粒优先长大,600℃受热下,晶粒快速长大。在500~600℃内,搅拌摩擦加工细晶TA2工业纯钛晶粒的生长指数为3,生长激活能为328. 5 kJ/mol。研究表明,通过搅拌摩擦加工获得的细晶组织具有较好的晶粒稳定性。
Fine grained TA2 commercial pure Ti was prepared by friction stir processing with 180 r/min and 25 mm/min. The average grain size of the processed TA2 alloy was 2 μm. Thermal stability and grain growth kinetics of fine grained TA2 alloy were studied. SEM images and EBSD results were used to analyze the microstructure and texture after annealing. The results showed that the texture of friction stir processed TA2 alloy was stable and c-axes were approximately parallel to processing direction after annealing treatment. Some grains preferentially grew up when the sample underwent heat treatment at 550 ℃. When the temperature reached 600 ℃,fine grains grew fast. When annealed between 500 ℃ to600 ℃,the grain growth exponent and the activation energy were 3 and 328. 5 kJ/mol,respectively. The microstructure and texture of fine grained TA2 prepared by friction stir processing could remain stable at 500 ℃.
引文
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