A Novel Al‐Rich/Ti–6Al–4V Layered Composite with Superior Wear and Electrochemical Behavior. Issue 8 (3rd June 2020)

• Record Type: Journal Article
• Authors: Liu, Shaopeng; Zhang, Zhong; Tang, Yongbo; Chen, Yungui
• Is Part Of: Advanced engineering materials. Volume 22:Issue 8(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-06-03
• Subjects: Al-rich/Ti–6Al–4V layered composite -- blended elemental powder metallurgy -- electrochemical behavior -- wear resistance; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.202000300
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : By adding a certain amount of Al to the surface of Ti–6Al–4V (TC4) alloy, a novel layered composite composed of TC4 alloy matrix and Al‐rich alloy is designed and successfully fabricated by a blended elemental powder metallurgy (BE PM) method. The results demonstrated that after the addition of 1 wt% Al, the layered composite exhibits superior wear and electrochemical behavior over powder metallurgy Ti–6Al–4V (PM TC4) alloy, which indicates that a wear‐resistant and corrosion‐resistant layer can be in situ synthesized on the sample surface. Moreover, the volume fraction of α phase, the thickness of α colonies, porosity, Rockwell hardness, and wear resistance of the layered composites increase significantly with Al addition, resulting in the decrease in area, width, and depth of wear tracks, and the reduction of average friction coefficients (COFs). Furthermore, with the addition of Al, the galvanic effect at the interface of α / β phase reduces, whereas the porosity of the layered composites, the chemical activity, and the corrosion rate of α phase increase significantly. Therefore, the corrosion resistance of the layered composites increases first and then decreases with Al addition, and the optimum value can be achieved when the added amount of Al is 1 wt%. Abstract : By adding a certain amount of Al to the surface of Ti–6Al–4V (TC4) alloy, a novel Al‐rich/TC4 layered composite is designed and successfully fabricated by a blended elemental powder metallurgy (BE PM) method, and the results demonstrate that the layered composite exhibits superior wear and electrochemical behavior over PM TC4 alloy after the addition of 1 wt% Al.