Microstructure and Mechanical Properties of In-situ Synthesized TiC and TiB Reinforced Titanium Matrix Composites
摘 要
通过真空自耗熔炼、锻造、退火等工艺制备得到不同含量原位自生TiC、TiB,以及TiC+TiB(体积比1∶1)钛基复合材料,研究了其显微组织、室温和高温(300 ℃)拉伸性能以及室温压缩性能,并分析了室温拉伸时TiC和TiB强化作用之间的耦合关系。结果表明:复合材料的基体组织为变形α组织,TiC呈细小等轴状和略微粗大椭球状,TiB呈短纤维状;当增强体总体积分数相同时,TiC+TiB的强化效果高于TiC或TiB的,且随着增强体体积分数的提高而增强,但复合材料的塑性明显下降;复合材料室温拉伸断裂方式主要是增强体的承载断裂,而高温拉伸时的断裂方式包括增强体的承载断裂和部分TiB短纤维与基体的脱黏;室温拉伸时,TiC与TiB的强化作用与细晶强化作用间满足耦合系数1.5的叠加关系。
Abstract
The different contents of in-situ synthesized TiC, TiB and TiC+TiB (volume proportion of 1:1)/Ti titanium matrix composites were prepared by vacuum consumable melting, forging and annealing process, and the microstructure, tensile properties at room temperature and high temperature (300℃) and compression properties at room temperature were studied. The coupling relationship between the strengthening effects of TiC and TiB during stretching at room temperature was analyzed. The results show that the matrix structure of composites was deformed α structure; TiC presented fine equiaxed shape and slightly thick ellipsoidal shape, and TiB presented short fiber shape. When the total volume fraction of reinforcements was fixed, the strengthening effect of TiC and TiB was higher than that of TiC or TiB, and increased with the increase of volume fraction of reinforcements; however, the plasticity of composites decreased obviously. The main tensile fracture mode of composites at room temperature was bearing failure of reinforcements, while the fracture mode at high temperature included bearing failure of reinforcements and debonding of some TiB short fibers with matrix. The relationship of strengthening effects between TiC and TiB reinforcements and fine-grain met the superposition of coupling coefficient of 1.5 during stretching at room temperature.
中图分类号 TB333 DOI 10.11973/jxgccl202001011
所属栏目 材料性能及应用
基金项目 国家自然科学基金资助项目(51371114)
收稿日期 2018/11/20
修改稿日期 2019/10/14
网络出版日期
作者单位点击查看
备注徐欢(1993-),男,安徽池州人,硕士研究生
引用该论文: XU Huan,GUO Xianglong,Lü Weijie. Microstructure and Mechanical Properties of In-situ Synthesized TiC and TiB Reinforced Titanium Matrix Composites[J]. Materials for mechancial engineering, 2020, 44(1): 62~67
徐欢,郭相龙,吕维洁. 原位自生TiC与TiB增强钛基复合材料的组织和力学性能[J]. 机械工程材料, 2020, 44(1): 62~67
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【4】LORETTO M H, KONITZER D G. The effect of matrix reinforcement reaction on fracture in Ti-6Al-4V base composites[J].Metallurgical and Materials Transactions, 1990, 21(6):1579-1587.
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【8】张长江,林四波. TiC含量对高温钛基复合材料组织与性能的影响[J].稀有金属材料与工程,2017,46(1):185-189.
【9】唐骜,黄陆军. 增强体含量对TiBw/Ti复合材料组织和力学性能的影响[J]. 复合材料学报,2013(增刊1):90-95.
【10】肖伯律,马宗义,毕敬. TiBw与TiCp原位增强钛基复合材料的高温蠕变性能[J].金属学报,2002,38(9):994-997.
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【12】XIAO L, LU W, YANG Z, et al. Effect of reinforcements on high temperature mechanical properties of in situ synthesized titanium matrix composites[J].Materials Science and Engineering:A, 2008,491(1/2):192-198.
【13】NARDONE V C, PREWO K M. On the strength of discontinuous silicon carbide reinforced aluminum composites[J]. Scripta Metallurgica, 1986, 20(1):43-48.
【14】FUKUDA H. A probabilistic theory of the strength of short-fibre composites with variable fibre length and orientation[J]. Journal of Materials Science, 1982,17(4):1003-1011.
【15】MEYERS M A, CHAWLA K K. Mechanical behaviour of materials[M]. Saddle River:Prentice Hall, 1999.
【16】HUANG J C, ARDELL A J. Addition rules and the contribution of δ' precipitates to strengthening of aged Al-Li-Cu alloys[J]. Acta Metallurgica,1988, 36(11): 2995-3006.
【17】SCHLIESER C, NEMBACH E. Strengthening of aluminium-lithium alloys by long-range ordered δ'-precipitates[J]. Acta Metallurgical et Materialia,1995,43(11): 3983-3990.
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