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EFFECTS OF RARE EARTH MIXTURE ON MECHANICAL PROPERTIES OF CuZnAl SHAPE MEMORY ALLOYS

N.C.Si and S.C.Sun Departmentof Materials Engineering , Jiangsu University of Science and Technology , Zhenjiang 212013 , China

金属学报(英文版)

With thehelpofquantitative metallograph ,tensiletest,electron probeandscan electron mi croscope,theinfluencesof mixture rareearth ( RE) on the grain size, dynamics of grain growth and mechanicalpropertiesof CuZnAlshape memoryalloys wereinvestigated . Theex perimentalresultsshowsthat REcanrefinegrainsgreatly,improvethe mechanicalpropertiesremarkably andchangethetensilefracturefrom brittletypebordered grainstoplastictypeinthecondition of maintainingshape memory properties. Moreover microstructuresrevealthatREwhich accumulates on the grain boundariescan restrain grains’growing. In addition, the mechanismsofrefininggrainsizeandimproving mechanicalpropertiesarealsodiscussed.

关键词: rareearth , null , null , null

LASTER SURFACE CLADDING BY Co BASE ALLOY WITH Ce ON 20 # STEEL PERFORMANCE AND MICROSTURCTURE STUDYS

L.J.Shang1 2) , Y.Wang2) , Q.K.Cai1)and C.S.Liu1) 1) Northeastern University , Shenyang 110006 , China 2) Shenyang University , Shenyang 110044 , China

金属学报(英文版)

Onthebase of 20 # steel, Co base alloy with Ce and without Ce was obtained with laser heatingtechnology. Theresultshowsthat Cehasobviouslyeffecton alloy microstructureespe ciallyimprovethecorrosion resistancein acid by31 % ,oxygenation resistanceby23 % ,in al kalescent liquid by 23 % . Improve fearlessness 30% and improve hardness by 168 HV.Throughcontrast and analysison the Co base microstructure with Ce and without Ce . The paper discussthetheory of Ce modification Co base alloy from theside of cooling thermody namicsand dynamics

关键词: rareearth , null , null , null

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