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潘浩,毛小南,黄朝文,韩栋,王晶,赵永庆,辛社伟.α相对高强韧Ti-55531合金强化及断裂机制的影响[J].稀有金属材料与工程(英文),2018,47(1):103~107.[Pan Hao,Mao Xiaonan,Huang Chaowen,Han Dong,Wang Jing,Zhao Yongqing and Xin Shewei.Influence of α phase on strengthen and fracture mechanisms of high strength-toughness Ti-55531 alloy[J].Rare Metal Materials and Engineering,2018,47(1):103~107.]
Influence of α phase on strengthen and fracture mechanisms of high strength-toughness Ti-55531 alloy
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Received:October 14, 2015  Revised:December 11, 2015
DOI:
Key words: high strength-toughness Ti-55531 alloy  microstructure  properties  strengthen mechanism  fracture mechanism
Foundation item:国家自然科学基金资助(项目号51471136);国家国际科技合作 (中法合作) 项目资助( 项目号015DF151430)
Author NameAffiliation
Pan Hao,Mao Xiaonan,Huang Chaowen,Han Dong,Wang Jing,Zhao Yongqing and Xin Shewei  
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Abstract:
      In order to find the influence of α phase on tensile fracture behavior of high strength-toughness Ti-55531 alloy, different heat treatments and analysis methods including SEM, OM and XRD are adopted. Results show that the content of secondary α phase in bimodal microstructures are increased and the scale became finer, with decreasing of content and scale of primary α phase, so that the strength of alloy are increased and ductility are decreased. In lamellar microstructures, with coarsening of secondary alpha phase, both strength and ductility of the alloy are decreased. In full β microstructures, alloys get well in ductility but bad in strength. Both fracture modes of bimodal and lamellar microstructures are mix modes including transgranular cleavage, microvoid accumulations and intergranular crack fracture. As decreasing of content and scale of primary α phase, the content of secondary α phase are increased and the scale are coarsen, the percentage of microvoid accumulations fracture are decreased and percentage of transgranular cleavage and intergranular crack fracture are increased.