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《CHINESE JOURNAL OF MATERIAL RESEARCH》 1999-05
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DYNAMIC TENSILE PROPERTIES OF Ti 47Al 2Mn 2Nb 0.8TiB_2 ALLOY

WANG Yu LIN Dongliang (T.L.LIN) ** ( Department of Materials Science,the Open Laboratory of Education Ministry for High Temperature Materials & High Temperature Testing, Shanghai Jiaotong University, Shanghai 200030) ZHOU Yuanxin  
Room temperature tensile properties of Ti 47Al 2Mn 2Nb 0.8TiB 2 alloy with near lamellar (NL) microstructures were investigated at the strain rates between 20 and 10 3 s -1 using a self designed Split Hopkinson tensile bar setup with a rotating disk. And a comparison was made between static and dynamic tensile properties. It was found that tensile ductility fluctuates within a narrow range with the variation of the strain rate: dynamic elongation approximates to static elongation. But dynamic strengths (σ d ) of the alloy and the strain rate sensitivity are obviously higher than those under static strain rates, and there exists linear relationship between σ s and the logarithm of the strain rate, and between σ d and the strain rate itself. Fractography analysis indicated that the alloy fractures in a mixed mode of predominant transgranular cleavage and minor intergranular cracking under static and dynamic strain rates. Environmental effect was excluded from the main cause for the room temperature brittleness of the investigated alloy.
【Fund】: 国家自然科学基金
【CateGory Index】: TG146.23
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