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《Journal of Aeronautical Materials》 2006-05
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Influence of Microstructures on Mechanical Properties for TC21 Titanium Alloy

MA Shao-jun,WU Xue-ren,LIU Jian-zhong,WANG Li-fa(Beijing Institute of Aeronautical Materials,Beijing 100095,China)  
Mechanical properties,including tensile property,fracture toughness and fatigue crack growth rates,have been investigated for two different microstructures of two-phase titanium alloys,TC21.It was found from tensile test results that the lamellar microstructure has almost the same tensile strength but inferior ductility property compared with the basketweave microstructure.Fracture toughness of these two microstructures was improved by different mechanisms.Large crack growth rates of basketweave microstructure were found nearly the same with lamellar microstructure at lowerΔK range,but slower at higher ΔK range.The load direction on specimens has little influence on crack propagation behavior for these two types of microstructures.Transitions occurred in the Paris regime of crack growth rate curve of TC21,which are smilar to some other titanium alloys.
【Fund】: 863国家高技术研究发展计划基金(2002AA305107);; 航空基础科学基金(03G21008)
【CateGory Index】: TG113
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