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High-temperature oxidation resistance of a Ti–Al–Sn–Zr titanium matrix composites reinforced with in situ TiC and Ti5Si3 fabricated by powder metallurgy
Applied Physics A ( IF 2.7 ) Pub Date : 2020-03-04 , DOI: 10.1007/s00339-020-3431-x
Xiaojing Xu , Yangguang Liu , Vitus Tabie , Chengbin Cai , Yishui Xiao , Xu Zhang , Chong Li , Ze Jiang , Qingjun Liu , Hao Chen

A mixture of the Ti–Al–Sn–Zr matrix powder and SiC particles was used as a raw powder to fabricate an in situ TiC and Ti5Si3 reinforced titanium matrix composites (TMCs) via low energy ball milling–cold press forming–argon-protected sintering. The effects of various content of SiCp on the microstructure, phase composition and high-temperature oxidation behavior of the composites at 750 °C and 850 °C were studied. XRD results show that the oxidation phases were mainly composed of TiO2, Al2O3, SiO2 and α-Ti. According to the SEM images, the cross-sectional morphology of oxidation at 750 °C for 100 h shows that the oxide layer (20.00 μm) in the TMCs with 10.0 vol% SiCp after oxidation was denser and thinner and was 82.13% thinner than that of the matrix (98.00 μm). The parabolic rate constant (kp) of the oxidized composites decreases with the increase of SiCp content at 750 °C and 850 °C. In particular, the composites with 10 vol% SiCp content have smaller kp. All the results show that the addition of SiCp in TMCs can improve high-temperature oxidation resistance.

中文翻译:

粉末冶金原位 TiC 和 Ti5Si3 增强 Ti-Al-Sn-Zr 钛基复合材料的高温抗氧化性

以 Ti-Al-Sn-Zr 基体粉末和 SiC 颗粒的混合物为原料粉末,通过低能球磨-冷压成型-氩气保护原位制备 TiC 和 Ti5Si3 增强钛基复合材料(TMCs)烧结。研究了不同SiCp含量对复合材料在750℃和850℃下的显微组织、相组成和高温氧化行为的影响。XRD结果表明氧化相主要由TiO2、Al2O3、SiO2和α-Ti组成。根据 SEM 图像,750 °C 氧化 100 h 的横截面形貌表明,氧化后含有 10.0 vol% SiCp 的 TMC 中的氧化层(20.00 μm)更致密更薄,比氧化层薄 82.13%基质 (98.00 μm)。氧化复合材料的抛物线速率常数 (kp) 在 750 °C 和 850 °C 时随着 SiCp 含量的增加而降低。尤其是 10 vol% SiCp 含量的复合材料具有更小的 kp。所有结果表明,在TMCs中添加SiCp可以提高高温抗氧化性。
更新日期:2020-03-04
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