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钛工业进展:2020,37(6):1-6
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细小等轴α相对Ti-55531合金静态再结晶行为的影响
(1:西部超导材料科技股份有限公司特种钛合金材料制备技术国家地方联合实验室 2:西北工业大学 3:西安理工大学)
Effect of Fine Equiaxed α Phase on Static Recrystallization Behavior of Ti-55531 Alloy
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中文摘要: 初始等轴组织Ti-55531合金在相变点以上经过0.01、0.1、1 s~(-1)不同应变速率的等温压缩变形,随后进行750℃×5 min/AC热处理。采用扫描电子显微镜和透射电子显微镜研究了后续热处理时变形α相和基体β相的静态再结晶机理。结果表明,随着应变速率的升高,残留等轴α相的含量增加。变形合金中拉长α相在经过热处理后有球化现象,同时在强度相对较高的拉长α相端部的基体β相中,位错储能较高,有助于β相再结晶形核和空冷过程中局部高密度次生α相析出。
中文关键词: 钛合金  α相  β相  再结晶
Abstract:The initial equiaxed Ti-55531 alloy has been carried out the isothermal compression deformation with 0.01, 0.1 and 1 s~(-1) above the phase transformation point, and heat treatment at 750 ℃×5 min/AC. The scanning electron microscope and transmission electron microscope technologies were used to investigate the static recrystallization of deformed α and matrix β phases during subsequent heat treatment. The results show that the content of residual equiaxed α phase increase with the increase of strain rate. The spheroidization behavior of elongated α phase in the deformed alloy occurs after heat treatment. Meanwhile, the dislocation storage energy within β phase is large at the end of the elongated α phase with relative high strength, which facilitates the β recrystallization and nucleation and improved the local high-density secondary α-phase precipitation during air cooling.
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基金项目:国家自然科学基金资助项目(51501150);; 陕西省教育厅自然科学专项项目(16JK1570);; 陕西省自然科学基础研究计划资助项目(2020JM-461);; 西安市碑林区科技计划资助项目(GX2034)
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