放电等离子烧结<strong>TA15</strong>钛合金及石墨烯增强<strong>TA15</strong>复合材料微观组织与力学性能

doi:10.11900/0412.1961.2020.00186

金属学报

2021, Vol. 57

Issue (1): 111-120 DOI: 10.11900/0412.1961.2020.00186

研究论文

本期目录 | 过刊浏览

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

林彰乾¹^,², 郑伟³, 李浩¹^,², 王东君¹^,²(

)

^1.哈尔滨工业大学材料科学与工程学院哈尔滨 150001
^2.哈尔滨工业大学金属精密热加工国家级重点实验室哈尔滨 150001
^3.西安航天发动机有限公司西安 710100

Microstructures and Mechanical Properties of TA15 Titanium Alloy and Graphene Reinforced TA15 Composites Prepared by Spark Plasma Sintering

LIN Zhangqian¹^,², ZHENG Wei³, LI Hao¹^,², WANG Dongjun¹^,²(

)

^1.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
^2.National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
^3.Xi'an Space Engine Company Limited, ;Xi'an 710100, China

引用本文:

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.
Zhangqian LIN, Wei ZHENG, Hao LI, Dongjun WANG. Microstructures and Mechanical Properties of TA15 Titanium Alloy and Graphene Reinforced TA15 Composites Prepared by Spark Plasma Sintering[J]. Acta Metall Sin, 2021, 57(1): 111-120.

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摘要:

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。

关键词 ： TA15钛合金, 石墨烯, 放电等离子烧结, 微观组织, 力学性能

Abstract：

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 900^oC, 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 900^oC, 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.

Key words： TA15 titanium alloy graphene spark plasma sintering microstructure mechanical property

收稿日期: 2020-05-29

ZTFLH:

TF124

基金资助:国家自然科学基金项目(51674093)

作者简介: 林彰乾，男，1996年生，硕士生

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表1 不同烧结参数下TA15钛合金的密度

图1 不同烧结温度下TA15钛合金试样的XRD谱

图2 不同烧结温度下TA15钛合金试样的SEM像(a) No.1 (b) No.2 (c) No.3 (d) No.4 (e) No.5 (f) No.6

图3 不同烧结温度下TA15钛合金试样的压缩力学性能(a) room temperature (b) 500oC

图4 不同烧结时间和烧结压力下TA15钛合金试样的XRD谱和SEM像

表2 不同烧结时间及烧结压力下TA15钛合金的压缩力学性能

图5 石墨烯增强TA15复合材料的XRD谱、Raman光谱、Raman面扫描、SEM像与压缩力学性能

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