Evaluation of Surface Mechanical Properties and Grindability of Binary Ti Alloys Containing 5 wt % Al, Cr, Sn, and V

• Published in: Metals (Basel ) Vol. 7; no. 11; p. 487
• Main Authors: Lim, Hae-Soon, Hwang, Moon-Jin, Jeong, Ha-Na, Lee, Woon-Young, Song, Ho-Jun, Park, Yeong-Joon
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 09-11-2017
• Subjects: Alloys; Binary alloys; Chromium base alloys; Diamond pyramid hardness; Grindability; grinding rate; grinding ratio; Grinding wheels; hardness; Mechanical properties; Solution strengthening; Surface properties; Tensile strength; Ti alloys; Titanium base alloys; Vacuum arc melting
• ISSN: 2075-4701; 2075-4701
• DOI: 10.3390/met7110487

This study aimed to investigate the relationship between the surface mechanical properties and the grindability of Ti alloys. Binary Ti alloys containing 5 wt % concentrations of Al, Cr, Sn, or V were prepared using a vacuum arc melting furnace, and their surface properties and grindability were compared to those of commercially pure Ti (cp-Ti). Ti alloys containing Al and Sn had microstructures that consisted of only α phase, while Ti alloys containing Cr and V had lamellar microstructures that consisted of α + β phases. The Vickers microhardness of Ti alloys was increased compared to those of cp-Ti by the solid solution strengthening effect. Among Ti alloys, Ti alloy containing Al had the highest Vickers microhardness. At a low SiC wheel speed of 5000 rpm, the grinding rates of Ti alloys showed an increasing tendency as the hardness values of Ti alloys decreased. At a high SiC wheel speed of 10,000 rpm, the grinding rates of Ti alloys showed an increasing tendency as the tensile strength values increased. The Ti alloy containing Al, which showed the lowest tensile strength, had the lowest grinding rate. The grinding ratios of the Ti alloys were higher than those of cp-Ti at both wheel revolution speeds of 5000 and 10,000 rpm. The grinding ratio of the Ti alloy containing Al was significantly increased at 10,000 rpm (p < 0.05).