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논문 기본 정보

자료유형
학술저널
저자정보
Yu Ren (North China Electric Power University) Jiankun Lin (North China Electric Power University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.11
발행연도
2021.11
수록면
4,357 - 4,367 (11page)
DOI
10.1007/s12540-020-00721-w

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초록· 키워드

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The influence of microstructure on the shock-induced strengthening behavior of Ti?6Al?4V (Ti-64) alloy was systematicallyinvestigated through plate impact experiments and quasi-static reload compression tests. Ti-64 displays no enhancedshock-induced strengthening effect at equivalent strain, regardless of the microstructure and shock stress amplitude. However,the shock-induced enhancement ratio is higher in the alloy having the bimodal microstructure with high equiaxed primaryα-phase (P ) volume fraction or the lamellar microstructure with wide α-platelets. The microstructure analyses show thatthe substructures of the postshock Ti-64 with both bimodal and lamellar microstructures are dominated by planar slip. Dislocations are easier to nucleate, move and tangle in those large-sized α phases, such as equiaxedP and wide α-platelet,leading to the formation of reticular substructures and slip bands. However, the dislocation density is relatively low in thesmall α plate of the transformed β regions and in the narrow α-platelet, which is attributed to the relaxation of shock stressand consequently to the suppression of dislocation nucleation caused by the obvious grain/phase boundary damping effect. Only a small number of twins were formed in the lamellar microstructure with wide α-platelet, indicating that grain size andinterface damping also affect the twinning behavior of Ti-64 under shock loading conditions.

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