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THE PREPARATION AND APPLICATION OF ELECTROPLATED SHEET CONTAINING RS ALUMINUM ALLOY POWDERS

Y.S. Dong and P.H. Lin (Department of Mechanical Engineering , Southeast University , Nanjing 210096 , China) J. Shen and Q.C. Li (School of Materials Science and Engineering , Harbin Institute of Technology , Harbin 150001 , China)

金属学报(英文版)

Baded on the study of nickel electroplating technology at room temperature, the plated sheet containing rapidly solidified Al-Fe-Cu- V-Si-Ni-Ce-Zr aluminum alloy powders is constructed successfully. The powders and nickel matrix are combined well in the sheet. It can be used to prepare the observation specimen for TEM and determine the hardness of single powder particle as solidified and after heat-treated. The advantages of this method are the realization of heat treatment of powders and the TEM observation of non-interfered microstructure of powders in the size of several microns.

关键词: aluminum alloy powder electroplating , null , null

EFFECT OF ELONGATED GRAIN STRUCTURE ON THE MECHANICAL PROPERTIES OF AN Fe_3Al-BASED ALLOY

X.Q. Yu and Y.S. Sun (Department of Materials Science and Engineering , Southeast University , Nanjing 210096 , China)

金属学报(英文版)

The effect of hot-rolling processing on microstructure as well as the relationship between the elongated grain structure and tensile properties are investigated. The results indicate that the elongated grain structure influences the tensile properties and creep rupture life of Fe3Al alloy significantly. For the better strength and ductility at RT,a thinner elongated grain structure is desirable. When the elongated grain size is increased, the tensile properties will be decreased. On the other hand, the creeP rupture life at 600℃ is increased with the increase of elongated grain size.

关键词: Fe_3Al-based alloy , null , null

TENSILE PROPERTIES AND CREEP RESISTANCE OF AZ91 ALLOY CONTAINING ANTIMONY

G. Y Yuan , YS. Sun , WM. Zhang and YH Bao(Department of Materials Science and Engineering , Southeastern University , Nanjing 210096 , China)

金属学报(英文版)

Small amount Of antimony addition to the Mg-9Al-0.8Zn-0.2Mn (AZ91) alloy resulted in the obvious increase of tensile strengths at both ambient and elevated temperatures.The creep resistance at the temperatures ap to 200℃ was also improved significantly by antimony addition. Mcrostructurul observations revealed that the addition of antimony modified morphology of the α(Mg17Al12) phase and caused the formation of some rod-shaped precipitates Mg3b2 at grain boundaries. These precipitates have high thermal stability and play an important role for strengthening groin boundaries at elevated temperutures.

关键词: magnesium alloy , null , null

EFFECTS OF COMBINED ADDITIONS OF TUNGSTEN AND MOLYBDENUM ON THE CREEP PROPERLIES OF Fe_3Al-BASED ALLOYS

X.Q. Yu and Y.S. Sun (Department of Materials Science and Engineering , Southeast University , Nanjing 210096 , China)

金属学报(英文版)

Effects of combined additions of tungsten and molybdenum on the creep properties of Fe3AI-based alloys have been investigated. Results show that combined additions of tungsten and molybdenum increase significantly the creep rupture life of the Fe3Al base alloys at high temperature. TEM analysis of the alloys containing tungsten plus molybdenum indicates that both solid-solution strengthening and precipitation harden- ing make the significant increase of creep rupture life.

关键词: Fe3Al , null , null , null

TENSILE PROPERTIES AND CREEP RESISTANCE OF Fe_3Al-BASED ALLOYS CONTAINING NIOBIUM

ZHANG Zhonghua , SUN Yangshan , GUO Jun(Department of Materials Science and Engineering , Southeast University , Nanjing 210096 , China)

金属学报(英文版)

Small amount(0.5-0.8at.%) of niobium addition to the multicomponent alloys based on Fe3Al(Fe-28Al-5Cr-0.5Mo-0.05Zr-0.05B-0.1Ce) results in the microstructural refinement and the increase in the yield strength at temperatures up to 600℃,but is not beneficial to room temperature ductility.Results of microanalysis indicate that the addition of niobium causes the formation of precipitates with complex compositions which strengthen both matrix and grain boundaries and enhance the creep resistance of the alloys.

关键词: :Fe_3Al , null , null , null

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