ELECTRON-OPTICAL INVESTIGATION OF HYDROGEN-INDUCED DEFORMATION IN NICKEL SINGLE-CRYSTAL FOILS

被引:6
作者
CARPENTER, RW [1 ]
BAUER, GS [1 ]
机构
[1] KFA JULICH GMBH,INST FESTKORPERFORSCH,D-5170 JULICH 1,FED REP GER
来源
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1979年 / 10卷 / 01期
关键词
D O I
10.1007/BF02686401
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Direct experimental evidence for hydrogen absorption in nickel during electropolishing is presented. Single crystal nickel disks were charged with hydrogen by thinning to electron transparency in a strong acid solution at room temperature. Thin regions of the crystals underwent plastic deformation due to hydrogen absorption during the thinning process. The deformation substructure consisted principally of planar arrays of unit slip dislocations and coplanar microtwins in the thinnest regions of the foils. Cracks at the foil edges were often associated with the microtwins. The stress system in the foil is a result of nonuniform hydrogen distribution. The formation of microtwins is consistent with the three-layer microtwin mechanism proposed by Mahajan and Chin.25 The origin of the cracks at the foil edges is most probably associated with slip on planes inclined to the foil surface near the microtwins, rather than a consequence of the microtwinning itself. © 1979 American Society for Metals and the Metallurgical Society of AIME.
引用
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页码:13 / 20
页数:8
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