Phase transformation studies in U-Nb-Zr alloy

被引：8

作者：

Lopes, Denise Adorno ^{[1
,2
]}

Guisard Restivo, Thomaz Augusto ^{[2
,3
]}

Padilha, Angelo Fernando ^{[2
]}

机构：

[1] Ctr Tecnol Marinha Sao Paulo, Lab Mat Nucl, BR-18560000 Ipero, SP, Brazil

[2] Univ Sao Paulo, Escola Politecn, Dept Engn Met & Mat, BR-05508030 Sao Paulo, Brazil

[3] Univ Sorocaba, UNISO, BR-18023000 Sorocaba, SP, Brazil

来源：

NUCLEAR ENGINEERING AND DESIGN | 2013年 / 265卷

关键词：

D O I：

10.1016/j.nucengdes.2013.09.024

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Phase transformation diagrams provide fundamental informations for designing thermomechanical processes being a must regarding uranium alloys nuclear fuels. The work shows the evaluation of a kinetic transformation diagram for U-7.5Nb-2.5Zr (wt.%) based on both calorimetry experiments and dilatometry allied to X-ray diffraction analysis. Calorimetry measurements in scanning and drop modes can detect enthalpies of heating and transformation onset points from ambient up to select isotherms while the dilatometer is used to scan for sample volume changes related to phase transformations. The resulted kinetic diagram shows the gamma phase is stable for this alloy, guiding the rolling deformation process to temperature ranges where this phase remains for longer periods. Comparing to the literature results, the low temperature transformation (300-400 degrees C) is shifted to longer times accordingly to the disclosed TTT kinetic diagram. Therefore, two forming process windows can be proposed at 200 C and 400 C neighborhood where gamma-phase remains for enough time to accomplish total reduction. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：619 / 624

页数：6

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