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SURFACE STATE AND CATALYTIC ACTIVITY OF ACTIVATED AMORPHOUS Fe_(80)Zr_(12)B_8 ALLOY

WANG Xike SHEN Ningfu CHEN Haisong Zhengzhou Institute of Technology , Zhengzhou , ChinaZHANG Haifeng Luoyang Research Institute for Ship Materials , Luoyang , ChinaGU Haicheng Xi'an Jiaotong University , Xi'an , China Professor , Research Centre for Materials , Zhengzhou Institute of Technology , Zhengzhou 450002 , China

金属学报(英文版)

The depth profile of composition,chemical state of elements and morphology of as- received and activated amorphous Fe_(80)Zr_(12)B_8 alloy ribbons have been studied by means of Auger electron spectroscopy,X-ray photoelectron spectroscopy and scanning Auger microprobe combined with Ar ion bombardment.Both dull and free sides of the as- received ribbons were covered with an iron oxide layer.While a pronounced surface segregation and oxidation of B and precipitation of microcrystalline α-Fe particles were observed on both sides of activated ribbons,B and Zr were oxidized selectively in subsurface layer.On both sides of ribbons,a porous surface structure formed. The BET surface area was measured to be increasing from 0.11 to 2.68 m~2/g.The principal mechanism of in situ activation has been discussed.

关键词: amorphous Fe_(80)Zr_(12)B8 alloy , null , null , null

TRACKING OBSERVATION ON SUBSURFACE CRACK IN BEARING STEEL GCr15 UNDER ROLLING CONTACT

CHEN Longqing Zhengzhou Institute of Technology , Zhengzhou , China CHEN Qing Luoyang Institute of Technology , Luoyang , China

金属学报(英文版)

Based on the sequent tracking observation on spalling of steel GCr15 under rolling contact fa- tigue,an expression for estimating the propagation of subsurface cracks was derived.The rol- ling contact fatigue life was found to be markedly related to the subsurface crack propagation angle.A new explanation of reason why the rolling contact fatigue life can be prolonged by residual compressive stress and retained austenite was advanced.

关键词: contact fatigue , null , null , null , null

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 , 450002 , China

材料科学技术（英文）

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.

关键词: rapid solidification , null , null , null

EFFECT OF Ti ON MICROSTRUCTURE OF RAPIDLY SOLIDIFIED Al-Si ALLOYS

SHAO Guosheng SHEN Ningfu Zhengzhou Institute of Technology , Zhengzhou , China

金属学报(英文版)

An addition of Ti as alloying element to Al-Si binary alloy will reduce the undercooling-abili- ty on rapid solidification of the melt-spun ribbon.The microstructure will be encoarsened even at initiation of its solidification,so as to aggravate the eellular segregation of Si in the alloy ribbon.

关键词: rapid solidification , null , null , null

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