Z.X. Yuan
,
S.H. Song
,
T.H. X.i
,
X.J. Zhangand Z.S. Yu(Department of Material
,
Wuhan Ye in University of Science and Technology
,
Wuhan 430081
,
China)(Department of Materials Physics
,
University of Science and Technology Beijing
,
Beijing 100083
,
China)
金属学报(英文版)
The infiuence of cerium on grnin boundaries of polycrpstalline N3Al alloys has beenstudied. The ja6mcability of a Ce-doped N3Al alloy strongly depends on the certumcontent. The alloy exhibits very poor fabrica6ility and cannot be fabrtcated into goodsheet8 by cold rolling when the concentmtion of cerium is <0. 0088wt% or>0.044wt%.A 0.011wt%Ce-doped N3Al alloy exhibits relatively good fabricability and may be fab-ricated into useful sheets by repeated cold rolling with 1OOa C annealing. The ductilityof the alloy strongly depends on the cerium distribution. Wthout the grain boundaryprecipitation of a second phase containing cer1um) the higher the segmpation level ofcerzum, the 6ettcr the tensile properties of the alloys, and in turn the more enhancedthe grain boundary cohesion.
关键词:
segregation
,
null
,
null
,
null
,
null
S.H. Song
,
null
金属学报(英文版)
Embrittlement of a 2.25Cr1Mo steel stemming from neutron irradiation at 270oC is studied by virtue of small punch testing in conjunction with scanning electron microscopy. The ductile-brittle transition temperature determined by the small punch test is much lower than that determined by the standard Charpy test. There is some irradiation-induced embrittlement effect after the steel is irradiated for 46 days with a neutron dose rate of 1.05?0-8 dpa/s.
关键词:
Irradiation
,
脆性
,
偏聚
,
低合金钢
,
压力容器
