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| Effect of Y2O3 on microstructure and mechanical properties of Ti-6Al-4V alloy connecting rod material |
| WANG Kun-kun1，LUO Tie-gang2,3，DONG Ying-hu1，ZHANG Rui-qing1，FANG Jun-xiao1 |
| 1 Institution of Materials Science ang Engineering，Nanchang Hangkong University，Nanchang 330038，China； 2Guangdong Institution of Materials and Processing，Guangdong Academy of Sciences，Guangzhou 510650， China；3Meizhou Yueke Institute of New Materials and Green Manufacturing，Meizhou 514768，China |
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Abstract The effect of Y2O3 content on the microstructure and mechanical properties of Ti-6Al-4V alloy produced by spark plasma sintering（SPS）using the Ti-6Al-4V＋xY2O3（x＝0，0.2%，0.4%，0.6%，0.8%）powders as raw materials was investigated with optical microscopy and TEM. The results show that the grain size will be refined through adding Y2O3，when the content of Y2O3 exceeds 0.2%，the grain size will increase with the increase of Y2O3 content；and the mechanical properties of Ti-6Al-4V alloy can be effectively improved through adding Y2O3， when the content of Y2O3 equals to 0.2%，the Ti-6Al-4V alloy achieve its best mechanical properties，in which the yield strength，the maximum compressive strength and the compressive strain are 970 MPa，1 852 MPa and 31.4% respectively，and improves by 7.8%，14.1% and 19.4% respectively compared with Ti-6Al-4V alloy without adding Y2O3，and its densification increases to 99.28%. The Y2O3 mainly improves the mechanical properties of Ti-6Al-4V alloy by increasing the density of Ti-6Al-4V alloy and the pinning effect in the alloy.
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Received: 03 June 2019
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2020, Vol. 30 
