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A VALVE FOR TEMPERATURE CONTROL DOMINATED BY SHAPE MEMORY ALLOYS

X.L.Yang1) , X.Sun2) , C.W. Wang 2) , D.Q. Geng2)and C.M. Liu 2) 1)Schoolof Mechanical Engineering and Automation , Northeastern University , Shenyang 110006 , China 2)Schoolof Material & Metallurgy , Northeastern University , Shenyang 110006 , China

金属学报(英文版)

Thispaperintroducesa valve which useshape memory alloys( SMA) fortemperaturecon trol, which makes useof deformation of SMAcaused by variation oftemperaturetocontrolmechanical parts. Thevalvecan beswitched on or off automatically and hasthe advantages ofsimplestructureand reliable performance.Itcan beusedin adverse workingconditionsor conditions with lower requirementson controlling precision ofthetemperatures. Consequent ly,it hasextensive application prospects.

关键词: shape memory alloy , null , null

RELATION BETWEEN THE INTERGRANULAR SEGREGATION OF SAND THE HOT DUCTILITY IN HIGH PURITY Fe SALLOYS

C. M. Liu1) , K. Abiko2) and M. Tanino2) 1) Schoolof Materials and Metallurgy , Northeastern University , Shenyang 110006 , China 2) Institute for Materials Research , Tohoku University , Sendai980 , Japan

金属学报(英文版)

Effectoftheintergranularsegregationof Sonthehot ductilityof high purityiron wasquan titativelyinvestigated using high purityiron specimenscontaining < 2 ,5,10 ,20 and 60massppm Sby scanning AES,tensiletests under high vacuum and SEMof the fracturedsurface. The main resultsareasfollows: high purityironcontaininglessthan 2 massppm Sexhibitsanexcellenthotductility,thatis,reductionofareatofracturelargerthan95 % ,at alltesttemperaturesbetween673 and 1173 K. Dissolved Sof5 massppm causesanevident hot ductility dropof high purityiron at873～973 K.Increasingthedissolved Scontentfur ther decreases hot ductility and widensthetemperaturerange ofembrittlement. Theembrit tledspecimensfailinintergranular mode. Theamountoftheequilibrium intergranularseg regation of Sincreases withincreasingtheconcentration of dissolved Sand with decreasingthe annealingtemperature. Ssegregates much moreon cavitysurfacesthan atgrain boundaries.

关键词: high purityiron , null , null , null , null , null

PREVENTION OF THE INTERGRANULAR FRACTURE AT ELEVATED TEMPERATURES BY ADDITION OF PHOSPHORUS TO A HIGH PURITY Fe0 002% SALLOY

C. M. Liu1) , K. Abiko2) and M. Tanino2) 1) Schoolof Materials and Metallurgy , Northeastern University , Shenyang 110006 , China 2) Institute for Materials Research , Tohoku University , Sendai980 8579 , Japan

金属学报(英文版)

Theeffectof phosphorusonthehotductility andthesegregation ofsulfuratgrain boundariesin high purityironcontaining 0 002 % sulfur werequantitativelyinvestigated bytensiletestat973 K, SEMobservation of fracture surface and scanning Auger electron spectroscopy.Theexperimental resultscan besum marized as follows:(1) addition of phosphorustothe iron remarkablysuppressestheintergranular fractureinduced bythesegregation of sulfur at973 Kandincreasesthe hot ductility;(2) phosphorusstrikingly decreasesthesegregation ofsulfur atgrain boundaries, whichisresponsibleforthesuppressionoftheintergranularfrac tureat973 K;(3) theremarkably decreasedsegregation ofsulfur atgrain boundariesbytheaddition of phosphoruscan beexplained bythesitecompetitioneffectandtherepulsiveinter action at grain boundariesbetweensulfuratomsand phosphorusatoms;(4) sulfurstrikinglysegregatestothevoid surfacesformed on grain boundaries, while phosphorushaslittlesegre gationtothevoid surfaces.

关键词: high purity iron , null , null , null

RECRYSTALLIZATION TEXTURE INCOLD ROLLED Cu 30mass%Zn BRASS HEATED BY LASER BEAM

Y.N.Wang1) , B.L.Wu2) , L.Zuo1) and Z.D.Linag1) 1) Department of Materials Science & Engineering , Northeastern University , Shenyang 110006 , China 2) Shenyang Institute of Aeronautical Engineering , Shenyang 110034 , China

金属学报(英文版)

Heating rate playsanimportantroleon recrystallizationtextureofcold deformed metals.Inthispaper,thelaser heatingtechnique wasusedtotheultrarapidlyannealingon acold rolledCu 30 mass% Zn alloy. The experimental resultsshow thatthe texture development differs from those observed in the case of conventional annealing. When primary recrystallization completes,the grainsizeisvery fineandthegrain orientation distributionisalmostrandom . Withthecontinuousgrain growing,the dispersioncharacterofthegrainorientationsstillre mains. The possible mechanismson theevolution of ultrarapid recryctallization texture were discussed.

关键词: Cu 30 mass% Zn alloy , null , null

RECRYSTALLIZATION IN A SPINODAL Cu Ni Fe ALLOY

S.M. Hao , X.J. Hao , G. Zhao and H.X. Li Schoolof Materials and Metallurgy , Northeastern University , Shenyang 110006 , China

金属学报(英文版)

Theinteraction ofspinodaldecomposition and recrystallization process,andthecharacteristic ofrecrystallizationin Cu Ni Fe alloy aged atdifferenttemperaturesaftersolution treatmentandcold rolling have been studied by structural analysis and Vickers hardnesstest. It has shownthat the recrystallization of spinodal Cu Ni Fe alloy might be divided into 2 types:spinodal decomposition, recovery and recrystallization oftwo phase microstructuretook placein the deformed alloy aged below thespinodaltemperature; whilerecrystallization ofsingle phase microstructureand growth offullyrecrystallized grainstook placeinthedeformed al loy aged abovethespinodaltemperature .The deformed alloyaged below thespinodaltemper aturerecrystallizedin cellular morphology.

关键词: spinodaldecomposition , null , null

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