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
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.
2020, Vol. 30 
