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Abstract
TiC-doped W-Ti composites were prepared by mechanical alloying and spark plasma sintering. The influence of milling time on the microstructure and properties of TiC-doped W-Ti composite material was investigated. Results show that with increasing ball milling time, powder particles undergo a process of fracture-cold welding-fracture. Powder grains are continuously refined to 25.1nm, and micro-strain continuously increases from 0.324% to 0.724%. With the extension of ball milling time, the sintered composite material exhibits a declining trend in density and an initial decrease and later increase in grain size. The minimum grain size is noted in the specimen WTT-60 at 0.35μm. Microhardness increases first then decreases, and the microhardness of specimen WTT-60 reaches the highest value (1139.27Hv) among those tested. Heat-shock resistance of the specimens was researched though a transient heat load experiment at pulse width 1ms, current 60A, and laser beam spot diameter 0.6mm (44∼47MW/m2).The bulk prepared by powder sintering from 60h of ball milling presents the best thermal shock resistance.
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