LIU Changqing
,
LI Meishuan
,
JIN Zhujing
,
WU Weitao Corrosion Science Laboratory
,
Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang
,
China research assistant
,
Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
The cantilever bending test,particularly monitored by an acoustic emission technique, was adopted to measure the tensile and interfacial adhesive strengths of the HCD ion plated fine TiN film on pure Ti substrate.The behaviors of film damaging were found to be characterized by:an internal tensile stress which exceeded its tensile strength for TiN facing upward,and a shearing stress along film substrate interface which exceeded its adhesive strength for TiN facing downward.The measured tensile and adhcsive strengths are 603 and 242 MPa respectively.
关键词:
tensile strength
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WANG Fuhui
,
LOU Hanyi
,
WU Weitao Corrosion Science Laboratory
,
Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang
,
China research assistant
,
Institute of Corrosion and Protection of Metats
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
The influence of defects on the oxidation, hot corrosion and thermal shock properties of sputtered Co-30Cr-6Al-0.5Y coatings was investigated.The results indicated that the nodular defects reduced the properties of the coatings.For the oxidation,the nodular defects resulted in the severe internal oxidation of aluminium,as a result,the pure alu mina scale could not form at very high temperature such as at 1 100℃.For the hot corrosion,the nodular defects served as the short-path for the diffusion of sulfur into the coating and the substrate,and caused the sulfidation,of the specimen.Moreover,the nodular defects became the crack source during the thermal shock test and decreased the thermal shock resistance.
关键词:
CoCrAlY coating
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XU Jian SUN Xiukui CHEN Wenxiu LI Yiyi State Key Laboratory of RSA
,
Institute of Metal Research
,
Academia Sinica
,
China research assistant
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
Permeability and diffusivity of hydrogen in Fe-Ni-Co based superalloy lncoloy 903 were measured over the temperature range of 220 to 420℃ using a gaseous permeation technique. The effect of strengthening phase γ' precipitated after being aged on the hydrogen permeation and diffusion was investigated.It was indicated that the permeability and diffusivity of hydrogen in the alloy hardly depend on heat treatment condition and are not af- fected by γ' phase precipitated after being aged.The relationships between the permeability and diffusivity of hydrogen and the temperature can be respectively expressed as Φ=9.36×10~(-5)exp[-54.20(kJ/mol)/RT]mol/m·s·MPa~(1/2)and D=4.24×10~(-7)exp[-49.07(kJ/mol)/RT]m~2/s.
关键词:
hydrogen permeation
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LIU Wei WANG Qun ZHAO Xinguo ZHAO Tong ZHANG Zhidong SUN Xiaokai Institute of Metal Research
,
Academia Sinica
,
Shengyang
,
China research assistant
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
Using pure Sm and Fe powders as starting materials,high coercive Sm-Fe-N mag- nets have been prepared by mechanical alloying in combination with beat treatment and nitriding.The best result is:_iH_c=33.1 kA/cm(41.6 kOe)and(BH)_(max)=98.7 kJ/cm~3(12.4 MGOe).The phases formed in the specimens during mechanical alloying, crystallizing and nitriding processes were examined by X-ray diffraction technique.The magnetic properties of the specimens were measured with the pulsed magnetometer in field up to 12 T.Experimental results show that mechanical alloying is an efficient ap- proach for preparing high coercive magnets.As an important factor for obtaining a high coercivity,the grain sizes of magnets are about tens of nanometer.The presence of some soft magnetic phases in the specimens leads to a neck on the demagnetization curve.
关键词:
Sm-Fe-N magnet
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