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金属学报(英文版) 1998
AN INVESTIGATION OF HIGH-TEMPERATURE DEFORMATION STRENGTHENING AND TOUGHENING MECHANISM OF TITANIUM ALLOYKeywords: titanium alloy,high-temperature deformation,strengthening and toughening mechanism Abstract: 1.IntroductionItiswellknownthatalpha-betatitaniumalloysareusuallyprocessedbyconventionalforging,i.e.,materialsareheatedandprocessedat30--50"Cbelowbetatransustemper-ature.Theconventionallyforgedtitaniumalloyshaveanequiaxedmicrostructure.Ingeneral,equiaxedmicrostructuresshowahigherductilityandhigherstrength,buthavelowerhigh--temperatureproperties,lowerresistancetofatiguecrackpropagationandlowerfracturetoughness1].Inthelate50s,anewforgingmethod,calledbetaforging,waspro-posedbyCroan2].Itbroket…
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