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    Effect of Ti Content on Microstructure and Wear Performance of TZM Alloys Produced by Mechanical Alloying Method
    (Korean Inst Metals Materials, 2021) Sirali, Haktan; Simsek, Dogan; Ozyurek, Dursun
    In this study, changes in microstructure, hardness and wear performance of titanium-zirconium-molybdenum (TZM) alloys produced by mechanical alloying method with the addition of different amounts of titanium (Ti) were investigated. Mechanically alloyed powders were sintered at 1300 degrees C for 4 h under 10(-6) mbar vacuum environment. The produced alloys were characterized by scanning electron microscope (SEM + EDS), X-ray diffraction, grain size distribution, hardness and density measurements. In the wear tests, three different loads and five different sliding distances were used. Results showed that the produced TZM alloys were porous, and the pores in the alloys containing 0.40% and 0.45% Ti were generally located on the grain boundaries. In alloys containing 0.50% Ti, inside the grain the pore sizes increase, while in the alloy containing 0.55% Ti, the pore sizes in grain boundary decrease. Grain size distribution results show that as the Ti content increased, the amount of grain size over 6 mu m decreased and smaller than 6 mu m increased. Hardness and density results show that while the hardness of TZM alloys produced increases depending on Ti content, their density decreases. The highest hardness was obtained in the TZM alloy containing 0.55% Ti, while the lowest density was obtained in the same alloy. Wear test results show that the lowest weight loss was obtained in TZM alloy containing the highest amount of Ti (0.55%) under all loads. Graphic
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    Investigation of the Effect of Zirconium Amount on Grain Size and Wear Performance in TZM Alloys Produced by Mechanical Alloying Method
    (Springer India, 2022) Sirali, Haktan; Simsek, Dogan; Ozyurek, Dursun
    In this study, the relation between grain size, hardness and wear performance of Titanium-Zirconium-Molybdenum (TZM) alloys with different amounts (0.06, 0.07, 0.08 and 0.09 wt%) of Zr added by the mechanical alloying method was investigated. As a result of the studies, it was observed that the number of pores in the structure increased with the increase in the amount of Zr, while there was a decrease in the grain size. In the hardness and density results, it was observed that while the hardness values increased with increasing Zr amount, there was a decrease in the density values. As a result of the wear tests, the lowest weight loss at 10-30 N loads was obtained in the TZM alloy with the highest Zr added (0.09% Zr). The lowest friction coefficient in the friction coefficient results was obtained in TZM alloy with 0.09% Zr added.