Diffusion along grain and interphase boundaries in alpha Zr and Zr-2.5 Wt PCT Nb alloy

被引:1
|
作者
Iribarren, MJ [1 ]
Iglesias, MM
Dyment, F
机构
[1] Argentine Atom Energy Commiss, CNEA, Mat Dept, RA-1429 Buenos Aires, DF, Argentina
[2] Natl Univ Buenos Aires, Dept Phys, RA-1428 Buenos Aires, DF, Argentina
[3] CNEA, Dept Mat, RA-1033 Buenos Aires, DF, Argentina
关键词
D O I
10.1007/s11661-002-0147-9
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Diffusion parameters of Cr diffusion along the alpha/beta interphase boundaries of a Zr-2.5 wt pct Nb alloy are presented. The conventional radiotracer technique combined with serial sectioning of the samples was applied. In the Arrhenius plot, it is possible to consider only one straight line (with Q = 133 kJ/mol for 615 < T < 953 K) or two zones (with Q = 230 kJ/mol for 773 < T < 953 K and Q = 77 kJ/mol for 615 < T < 773 K). An analysis is made of these results together with previous data concerning diffusion along short circuits paths in alpha-Zr (grain boundaries) and Zr-2.5 wt pct Nb (interphase boundaries): Zr and Nb as the alloy component elements and Ni, Fe, and Co as other relevant impurities. Different mechanisms are proposed: a vacancy mechanism for Zr and Nb and an interstitial-like mechanism for the impurities, for both kind of boundaries. The influence on diffusion and the estimated values of the impurities segregation in the a phase are discussed in the work.
引用
收藏
页码:797 / 800
页数:4
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