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Search Results: 1 - 10 of 299809 matches for " rapid solidification<br> "
All listed articles are free for downloading (OA Articles)
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Amorphous Formation in an Undercooled Binary Ni-Si Alloy under Slow Cooling Rate

Yiping Lu,Gencang Yang,Xiong Li,Yaohe Zhou,

材料科学技术学报 , 2009,
Abstract: High undercooling up to 392 K was achieved in eutectic Ni70.2Si29.8 alloy melt by using glass fluxing combined with cyclic superheating.A small quantity of amorphous phase was obtained in bulk eutectic Ni70.2Si29.8 alloy when undercooling exceeds 240 K under slow cooling conditions (about 1 K/s).The amorphous phase was confirmed by high-resolution transmission electron microscopy and differential scanning calorimetry.
Solute Redistribution Model for Multicomponent AHoys during Rapid Solidification
CHEN Kuiying LI Qingchun Deptof Metals,Technology,Harbin Institute of Technology,Harbin,China To whom correspondence should be addressed,
陈魁英
,李庆春

材料科学技术学报 , 1992,
Abstract: 1.IntroductionThe solute redistribution models for binary alloys during the rapid solidification havebeen extensively studied in recent years1-10],but up to now the solute redistribution modelfor multicomponent alloys has not been reported.In this paper the solute redistribution mod-el for the multicomponent alloys based on the Aziz model is established theoretically.
THE NONEQUILIBRIUM PARTITION MODEL OF SOLUTE DURING RAPID SOLIDIFICATION

科学通报(英文版) , 1992,
Abstract:
EUTECTIC GROWTH OF CAST IRON UNDER RAPID SOLIDIFICATION
GUO Jingjie JIA Jun LI Qingchun LI Bangsheng Harbin Institute of Technology,Harbin,China,
GUO Jingjie JIA Jun LI Qingchun LI Bangsheng Harbin Institute of Technology
,Harbin,China

金属学报(英文版) , 1992,
Abstract: The eutectic growth of cast iron during rapid solidification has been studied with laser remelt- ing and deep etching technology.A new mode of mushroom eutectic growth was observed oth- er than the usual honeycomb and lamellar ones.The mushroom eutectic growth may finally form the lamellar dendritic structure.
IMPROVEMENT OF DUCTILITY AND TOUGHNESS OF Ni-RICH NiAl AT ROOM TEMPERATURE
CHENG Tianyi Beijing Institute of Technology,Beijing,ChinaCANTORB University of Oxford,UKMcLEANM FLOWERHM Imperial College,UK CHENG Tianyi,associate professor,Faculty of Metallography,Beijing Institute of Technology,Beijing,China,
CANTORB
,McLEANM,FLOWERHM

金属学报(英文版) , 1993,
Abstract: In rapidly solidified Ni-34.6 at-% Al alloy,when the cooling the rate during solidification reached the order of 10~6 K/s,the size of the microstructures,such as the grains and substructure of the martensite,decreased dramatically.The various kinds of interfaces with high density and homogeneous distribution resisted effectively the propagation of the cracks and resulted in localized plastic deformation ahead of the tips of microcracks.The ductility and toughness at room temperature of the Ni-rich NiAl may be improved considerably.
ELECTRON MICROANALYSIS FOR LASER MELTED ZONE IN 45 STEEL WITH Fe-Ni-Cr COATING
CHENG Yongxing LI Genfu YU Shaoluo Shanghai University of Engineering Science,Shanghai,China WANG Huimin No,
CHENG Yongxing LI Genfu YU Shaoluo Shanghai University of Engineering Science
,Shanghai,China WANG Huimin No. Institute of China State Shipbuilding Corp.,Shanghai,China Associate Professor,Dept.No.,Shanghai University of Engineering Science,Xianxia Road,Shanghai,China

金属学报(英文版) , 1989,
Abstract: The Fe-Ni-Cr coating laver has been alloyed with 45 steel base metal by transverse.flow typeCO_2 gas laser of maximum output 5kW.The characteristics of the melted zone and the es-sence of the“bright band”has been investigated using the electron microscopy.The resultsshow that the“bright band”belongs to the melted zone and is a vertical section of the planecrystal,The width of the“bright band”equals the height of the plane crystal,which decreaseswith the increase of laser beam scanning rate and the decrease of laser power.This has beenexplained in terms of constitutional supercooling G/R.
EFFECTS OF RAPID SOLIDIFICATION ON CARBIDES IN A Ni-BASED SUPERALLOY
快速凝固对Ni基高温合金中碳化物的影响

CHENG Tianyi ZHANG Shouhua,
程天一
,章守华

材料研究学报 , 1991,
Abstract: 对常规铸态凝固和快速凝固高温合金中 MC 型碳化物的观察、分析表明,快速凝固后碳化物的形态、尺寸、成分和分布都发生了明显变化,这些变化对合金的高温力学性能有可能产生重要影响。
Superplastic Behaviour of a Rapidly Solidified Al-17Si Alloy
CHEN Guiyun WU Yue WANG Guozhi ZHANG Yongchang Institute of Metal Research,Academia Sinica,Shenyang,China,
陈桂云
,吴越,王国志,张永昌

材料科学技术学报 , 1992,
Abstract: A rapidly solidified Al-17Si alloy was pre-pared by the ultrasonic gas atomization andextrusion method.Its superplasticity was studiedunder constant cross-head speed tensile test condi-tion over the temperature range of 450℃ to 550℃and strain rate range of 1.67×10~(-4) to 6.17×10~(-2) s~(-1).The superplastic behaviour of theas-extruded and the thermomechanically treatedsamples was compared.It was found that thethermomechanical treatment was essential toachieving superplastic deformation.A maximumelongation of 445% was obtained at test tempera-ture of 550℃ and strain rate of 6.17×10~(-4) s~(-1).The microstructures before and after deformationwere studied using OM,SEM and TEM.Void for-mation on the primary Si phase interfaces wasfound to have detrimental effect on superplasticity.It was also noted that the primary Si phasecoarsened rapidly during superplastic deformation.The micromechanisms of superplasticity,phasecoarsening and void formation were discussed.
Featureless Zone in Rapidly Solidified Aluminum Alloy Splats
Ningfu SHEN Yali TANG Dongjie ZHANG Longqing CHEN Shaokang GUAN Research Centre for Materials,Zhengzhou Institute of Technology,Zhengzhou,China,

材料科学技术学报 , 1993,
Abstract: The microstructures of rapidly solidified (RS) Al-Fe-Ce-Ti and Al-Fe-V-Si alloys obtained by means of rotating blade quenching were studied with optical microscopy,transmission electron microscopy (TEM).The featureless zone observed in the two alloys reveals that the new technique offers a higher solidification rate than the inert-gas-atomized method.Under TEM observation the featureless zone presents virtually a micropartition or partitionless feature,and the solute contents in it are almost the same as the chemical composition of alloys.
SOLIDIFICATION CHARACTERISTICS OF HIGHLY UNDERCOOLED Ag-Ge EUTECTIC ALLOYS
SOLIDIFICATION CHARACTERISTICS OF HIGHLYUNDERCOOLED Ag-Ge EUTECTIC ALLOYS

CXDong,XYLuand BBWei,
C.X.Dong
,X.Y.Luand B.B.Wei

金属学报(英文版) , 1997,
Abstract: The Ag-Ge eutectic alloy system was intensively investigated with respect to its solidification characteristics at large undercoolings which were obtained by the B2O3 glass fluxing technique combined with argon protection. Grain size refinement was found in the Ag-15 wt% Ge hypoeuteciic alloy. With inereasing undercoolings the feather-like structure disappeared in the Ag-19wt% Ge eutectic alloy, and even silver slips showed up at sufficient undercoolings. Nevertheless, the fact that germanium had nucleated in preference to silver was indicated by a fine germanium line in the middle of the silver slips. The various morphologies of the germanium phase in the Ag-25 wt% Gehypereutectic alloy including the five-fold symmetry structure were explained by the joint action of high undercoolings (i.e. growth velocities) and density differences. The corpled zone of this alloy system was qualitatively estimated.
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