Effect of Rolling Temperature on the Microstructure and Tensile Properties of 47Zr-45Ti-5Al-3V Alloy
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Effect of Rolling Temperature on the Microstructure and Tensile Properties of 47Zr-45Ti-5Al-3V Alloy Y.B. Tan, C. Tian, W.C. Liu, S. Xiang, F. Zhao, and Y.L. Liang (Submitted June 6, 2017; in revised form September 24, 2017; published online March 7, 2018) The 47Zr-45Ti-5Al-3V (wt.%) alloy was solution-treated at 850 and 780 °C for 30 min and then rolled at different temperatures. The effect of rolling temperature on microstructure and tensile properties was investigated. The results showed that the microstructure contained a large amount of a phase at a rolling temperature of 600 °C. As the rolling temperature increased, the amount of a phase decreased, whereas the amount of b phase increased. When the rolling temperature was higher than 700 °C, the alloy was composed of a single b phase. The tensile properties of the alloy depended strongly on rolling temperature. The yield strength and tensile strength decreased with increasing rolling temperature, whereas the elongation increased. At a given rolling temperature, low solution treatment temperature resulted in higher strength and lower elongation than high solution treatment temperature. The fracture mode changed from cleavage fracture and quasi-cleavage fracture to dimple fracture with increasing rolling temperature. Keywords
47-45Ti-5Al-3V alloy, deformation, mechanical properties, microstructure, rolling, tensile test
1. Introduction Zirconium and its alloys have been gaining increased attention in nuclear and chemical engineering applications for many years because of low thermal neutron absorption cross section, adequate strength and ductility, good corrosion resistance, long-term dimensional stability in an irradiation environment, excellent compatibility with the fuel and coolant, good thermal conductivity and adequate resistance to fracture (Ref 1-3). A series of Zr alloys, including the Zr-Sn (Ref 4), ZrTi (Ref 5), Zr-2.5Nb (Ref 6), Zr-Nb (Ref 7), Zr-2.5Nb-0.5Cu (Ref 8), Zr-Nb-Sn-Fe (Ref 9, 10) and Zr-Mo (Ref 11) alloys, have been developed over the past 40 years. However, the tensile strength of these alloys was lower than 1000 MPa at room temperature, which was insufficient to meet the increasing requirements in aeronautical industries. To broaden the application of Zr alloys in aeronautical industries, a series of new ZrTiAlV alloys have been recently developed as advanced structural materials (Ref 12-14). The microstructure of ZrTiAlV alloys is composed of b phase above the b transus temperature, while consists of a phase when furnace-cooling to room temperature. Similar to Mg alloys, ZrTiAlV alloys with Y.B. Tan, Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, PeopleÕs Republic of China; and Guizhou Key Laboratory of Materials Structure and Strength, College of Materials and Metallurgy, Guizhou University, Guiyang 550025, PeopleÕs Republic of China; C. Tian and W.C. Liu, Key Laboratory of Metastable Materials Scien
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