放电等离子烧结TA15钛合金及石墨烯增强TA15复合材料微观组织与力学性能
收稿日期: 2020-05-29
修回日期: 2020-08-17
网络出版日期: 2020-08-28
基金资助
国家自然科学基金项目(51674093)
Microstructures and Mechanical Properties of TA15 Titanium Alloy and Graphene Reinforced TA15 Composites Prepared by Spark Plasma Sintering
Received date: 2020-05-29
Revised date: 2020-08-17
Online published: 2020-08-28
Supported by
National Natural Science Foundation of China(51674093)
采用放电等离子烧结(SPS)方法制备了TA15钛合金，并研究了烧结温度、烧结时间以及烧结压力参数对合金致密化、微观组织与力学性能的影响。结果表明：在烧结温度为800~1200℃、烧结时间为3~7 min、烧结压力为20~50 MPa的烧结条件下，烧结参数对TA15钛合金的物相组成影响不大；合金的微观组织主要由烧结温度决定，并且延长烧结时间会使微观组织发生一定的粗化，而烧结压力对微观组织没有明显的影响。升高烧结温度、延长烧结时间以及适当地增加烧结压力，有助于TA15钛合金致密化过程的进行。烧结态TA15钛合金的室温及高温压缩力学性能由合金的致密度和微观组织共同决定。采用SPS工艺在900℃及50 MPa的烧结条件下，5 min即可获得致密的TA15钛合金，并具有最佳的室温及高温综合力学性能。此外，在900℃、50 MPa和7 min的烧结条件下，采用SPS制备了0.5% (质量分数)石墨烯增强TA15复合材料，与TA15钛合金相比，复合材料室温与高温压缩屈服强度及极限抗压强度得到了明显提高。
林彰乾 , 郑伟 , 李浩 , 王东君 . 放电等离子烧结TA15钛合金及石墨烯增强TA15复合材料微观组织与力学性能[J]. 金属学报, 2021 , 57(1) : 111 -120 . DOI: 10.11900/0412.1961.2020.00186
Titanium alloys and titanium-based composites are widely used in the field of aerospace owing to their advantages such as low density and high specific strength. Graphene has been found to significantly improve the mechanical properties of metal matrix composites at a lower content due to high modulus, fracture strength, and specific surface area. To achieve excellent mechanical properties, TA15 titanium alloy was fabricated via spark plasma sintering (SPS), and the effects of sintering temperature, sintering time, and sintering pressure on the densification, microstructure, and mechanical properties of the obtained alloys were investigated. The results indicate that the sintering parameters exert trivial effect on the phase composition of the sintered TA15 titanium alloy. The microstructure of the sintered alloy is mainly determined by the sintering temperature, and the prolonged sintering time will cause microstructure coarsening. Meanwhile, the sintering pressure does not have obvious effect on the sintered microstructure. Furthermore, higher sintering temperature, longer sintering time, and accurate increase in sintering pressure contribute to the densification process of TA15 titanium alloy. At room and high temperatures, the comprehensive mechanical properties exhibited by the sintered TA15 titanium alloy are determined by density and microstructure. The dense TA15 titanium alloy can be fabricated via SPS under the sintering conditions of 900oC, 50 MPa, and 5 min. Such alloy exhibits optimally comprehensive mechanical properties at room and high temperatures. Additionally, 0.5% (mass fraction) graphene reinforced TA15 composites were fabricated by SPS under the sintering conditions of 900oC, 50 MPa, and 7 min. When compared with TA15 titanium alloy, the compression yield strength and ultimate compressive strength of composites have significantly improved at room and high temperatures.
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