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| Effects of Cr addition on microstructure and mechanical properties of powder metallurgy Ti-6Al-4V alloy |
| XU Jian1, WANG Wen-yan1,2, ZHANG Hao-yin1, XIE Jing-pei1,2, LI Luo-li1 |
1. School of Material Science and Engineering, He’nan University of Science and Technology, Luoyang 471003, China
2. He’nan Key Laboratory of Non-Ferrous Materials Science and Processing Technology, Luoyang 471023, China |
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Abstract Ti-6Al-4V alloy with different Cr content was prepared by the method of cold isostatic pressing and vacuum sintering. The effect of Cr addition on the microstructure and mechanical properties of Ti-6Al-4V alloy was investigated using optical microscope, mechanical properties testing and scanning electron microscope. The results show that the compound TiCr2 does not appear in the alloy after adding Cr element, and the alloy is composed of (α+β) phase, which belongs to widmanstatten structure. The addition of Cr element makes the relative density of the alloy decrease and the compressive strength increase. The compressive strength of the alloy is 1 855 MPa when Cr content is 4wt%. The fracture mode of alloy is ductile fracture when Cr content is 1wt% and 2wt%; while the fracture mode turns to dissociative fracture when Cr content is 3wt% and 4wt%.
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Received: 15 January 2014
Published: 18 December 2014
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2014, Vol. 24 
