Research on Relationship between Microstructures and Mechanical Properties of TA15 Bars
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摘要: 采用扫描电镜BEI和EBSD技术研究了TA15棒材片状和等轴组织的合金元素分布和组织结构对力学性能的影响。IQ图和成分分析表明,高达20%的合金溶质原子固溶在β相中产生显著的晶格畸变,导致β相固溶强化效果大于α相,固溶强化对TA15棒材屈服强度的贡献大于细晶强化,是两种组织具有相近屈服强度的主要原因。等轴组织棒材晶粒细小、点阵畸变大的β相均匀地分布在α相晶界上、29%的小角度晶界,使变形不易在局部集中而起到了均分变形的作用,提高了抗拉强度和塑性变形能力,综合性能优于片状组织。Abstract: Lamellar and equiaxed microstructures of TA15 bar were characterized by BEI and EBSD techniques,focusing on the alloying elements distributions and their effects on the corresponding mechanical properties.Image Quality（IQ）and chemical composition analysis indicate that 20% of alloying elements in solid solution of β phase produce remarkable lattice distortion and consequent higher solid solution strengthening than α phase.The contribution of solid solution strengthening is greater than that of grain refinement strengthening,resulting in a similar yielding strength of these two microstructures.The equixed microstructure with finer grains,uniform distribution of β phase and about 29% of low angle grain boundaries（LAGB）,exhibits homogeneous deformation and then raises the tensile strength and plasticity,making comprehensive mechanical properties better than those of the lamellar structure.
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Key words:
- TA15 bar /
- EBSD /
- low angle grain boundaries /
- structure /
- mechanical property
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