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
TIAN Baohong ZHENG Shi'an WU Lei Luoyang Institute of Technology
,
Luoyang
,
China ZHENG Shi'an
,
associate professor
,
Department of Materials Engineering
,
Luoyang Institute of Technology
,
Luoyang 471039
,
China
金属学报(英文版)
Determination was carried out of fatigue crack propagation rate of steel 65Cr5Mo3W2VSiTi (LM2)with various bainite contents and M/B duplex structure tempered at various tempera- tures.The threshold value of fatigue for each processing was estimated by experimental data. The mechanism for fatigue crack propagation of M/B duplex structure in steel LM2 seems to be non-continuous.The calculated fatigue crack micro-propagation rates are found to agree with the experimental data.
关键词:
duplex structure
,
null
,
null
,
null
LI Yan WU Yigui Luoyang Institute of Technology
,
Luoyang
,
ChinaHASHIMOTO Hatsujiro Okayama University of Science
,
Japan
金属学报(英文版)
The reversible transformation between matrix and martensite in Ni-Ti shape memory alloys has been dynamically observed under TEM.The orientation relation between martensite and austenite as well as the structural change near the transition temperature has been also studied with the help of HREM SADP.The results show that the orientation relation between martensite and austenite is[11]_A//[10]_M,[110]_A//[001]_M,(110)_A//(001)_M and the angle between(110)_A and(010)_M is about 6.5°.The crystal defects of martensite are found to be twin and stacking fault,and the twin plane as(100).
关键词:
Ni-Ti alloy
,
null
,
null
LI Zhi XI Jukui YANG Yunlin Luoyang Institute of Technology
,
Luoyang
,
China
金属学报(英文版)
The influence of high temperature repressing treatment on the segregation of phosphorus in the 93W alloy was carefully investigated by means of Auger electron spectroscope,EPMA, TEM and SEM.The segregation of phosphorus has been observed at the tungsten-tungsten grain boundaries,particularly at the tungsten-matrix interphases when the specimens were kept at the temperature in the range of 1200—1500℃ ,followed by furnace cooling.However, no segregation of phosphorus was observed at the interfaces after the specimens were re- pressed at the range of temperature,followed by furnace cooling.After investigation,the dis- locations in the matrix phase of as-repressed specimens directly influenced the phosphorus segregation to the interfaces.After annealing,the mechanical properties were reduced because of the phosphorus segregation at the interface boundaries.
关键词:
93W-4.5Ni-2.5Fe alloy
,
null
,
null
,
null
,
null
