CHEN Wenzhe QIAN Kuangwu FuZhou University
,
Fuzhou
,
Fujian
,
China Lecturer
,
Dept.of Mechanical Engineering
,
Fuzhou University
,
Fuzhou
,
Fujian
,
China
金属学报(英文版)
The effect of various dynamic strain aging(DSA)pre-treatment processes on pure bending fatigue strength of an 18-8 austenitic stainless steel was investigated.The results show that DSA pre-treatment processes increase remarkably the fatigue strength and the strengthening effects increase with increasing pre-strain temperature and pre-strain.The fatigue limit of specimens pre-treated by DSA is 87% higher than that by solution treatment,and 20% high- er than that by cold-working.TEM observations show that the uniform and stable dislocation networks with high density formed after DSA pre-treatment,which suppress effectively the initiation and propugation of fatigue cracks and increase the fatigue strength of materials.
关键词:
dynamic strain aging(DSA)
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null
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LIU Yihua Shandong University
,
Jinan
,
ChinaYA NG Linqian Huaqiao University
,
Quanzhou
,
Fujian
,
China LIU Yihua Associate Professor
,
Dept.of Physics
,
Shandong University
,
Jinan 250100
,
China
金属学报(英文版)
The amorphous CoZr soft magnetic films with superior properties were prepared by radio-frequency sputtering under pressure of 0.5Pa Ar.The saturation magnetization of the amorphous CoZr films with relation to the Zr content and temperature was investigated.The amorphous CoZr films composed of different constituents obey the Bloch T~(3/2)-low in a wide range of temperatures.The number of electrons transferred from each Zr atom to 3d energy band of Co calculated by the rigid band model is about 2.27.
关键词:
amorphous alloy
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null
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null
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XIAO Lingang QIAN Kuangwu Fuzhou University
,
Fuzhou
,
Fujian
,
China Correspondent:QIAN Kuangwu Professor
,
Institute for Materials Research
,
Fuzhou University Fuzhou
,
Fujian 350002
,
China
金属学报(英文版)
The apparent activation energy of serrated yielding was measured by two different methods for a commercial brass H68.The results showed that the apparent activation energy of serrat- ed yielding measured by a method involving(m+β)values increases with the grain size.In contrast,those measured by another method without involving(m+β)values are all the same for specimens with different grain sizes.Combining with the observation of the microstructures,the above phenomena have been explained.The method to measure the true activation energy of serrated yielding has also been proposed.
关键词:
serrated yielding
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null
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