微量增强体对TC18钛基复合材料微观组织的影响（英文）  

Effects of Trace Reinforcements on Microstructure of TC18 Titanium Matrix Composite

作　　者：孙曙宇[1] 吕维洁[2] 

机构地区：[1]台州学院,浙江台州318000 [2]上海交通大学金属基复合材料国家重点实验室,上海200240

出　　处：《稀有金属材料与工程》2017年第3期606-611,共6页Rare Metal Materials and Engineering

基　　金：Research Program of Zhejiang Education Department(Y201533396);National Nature Science Foundation of China(50871066)

摘　　要：使用真空自耗炉制备出多种微量TiB和TiC增强的Ti-5Al-5Mo-5V-1Fe-1Cr钛基复合材料,增强体在热处理过程中可大幅细化β相,但是细化幅度却随着增强体含量的增加而变缓,文中揭示出这和增强体的Zener拖曳力变化有关,增强体含量增加而拖曳力增幅变缓。此外还研究了增强体对α相球化的作用,α球化率随着增强体含量增加而小幅波动,然而在其作用下,等温压缩过程中魏氏体群结构中的板条状α明显加快了球化。等温压缩过程中,增强体对α球化的作用不同于热处理过程,除了显著加速扩散之外,微量增强体还可以通过促进界面转变而加速α相球化。Ti-5A1-5Mo-5V-1Fe-ICr titanium matrix composites reinforced with different mass fractions of TiB and TiC were fabricated via a consumable vacuum arc-remelting furnace. The reinforcements can significantly refine β phase during heat treatment. However, the extent of the microstructure refinement decreases gradually with the increase of the reinforcements. It is revealed that the microstructural phenomenon is associated with Zener dragging force exerted by the reinforcements. The increase rate of the dragging force tends to decrease with the increase of the reinforcements. Additionally, the effects of the reinforcements on the spheroidization of a were also investigated. The spheroidization rate of a fluctuates somewhat with increasing the trace reinforcements during heat treatment. Nevertheless, the reinforcements accelerate the spheroidization of a lath in the Widmannstatten structure obviously during isothermal compression. The effects of the reinforcements during isothermal compression are different from those during heat treatment. In addition to accelerating the diffusion significantly, the trace reinforcements also contribute to the spheroidization of a by accelerating interface transformation during isothermal compression.

关 键 词：TC18钛基复合材料 微量增强体 α相球化 β相细化 

分 类 号：TB333[一般工业技术—材料科学与工程]