SOME OBSERVATIONS ON DEFORMATION CHARACTERISTICS OF BULK POLYCRYSTALLINE ZIRCONIUM HYDRIDES .1. DEFORMATION AND FRACTURE OF HYDRIDES BASED ON GAMMA-PHASE

被引:65
作者
BARRACLOUGH, KG
BEEVERS, CJ
机构
[1] Department of Physical Metallurgy and Science of Materials, The University Edgbaston
关键词
D O I
10.1007/BF00550212
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The deformation behaviour of bulk polycrystalline zirconium hydrides in the composition range ZrH1.27 to ZrH1.66 has been investigated by compressive loading at temperatures between room temperature and ∼500° C. Single-phase δ-zirconium hydride is brittle below ∼ 100° C. Analyses of slip traces on δ specimens deformed at temperatures between ∼ 100 and ∼ 250° C have shown that the glide planes are {111} types. The deformation characteristics of δ and (δ + γ) alloys at temperatures between ∼ 100 and ∼ 500° C are consistent with the hydrogen vacancies in the δ-phase providing significant lattice friction to the movement of dislocations in the zirconium lattice of the hydride structure. The room temperature fracture stress of (δ + γ) alloys increases with the volume fraction of the γ-phase and this can be related to the resistance offered by γ platelets to the propagation of cleavage cracks in the δ matrix. In a (δ + γ + α) alloy the resistance to crack propagation at room temperature is further increased by the soft α-zirconium phase. © 1969 Chapman and Hall.
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页码:518 / +
页数:1
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