Density changes in plutonium observed from accelerated aging using Pu-238 enrichment

被引：44

作者：

Chung, B. W. ^{[1
]}

Thompson, S. R. ^{[1
]}

Woods, C. H. ^{[1
]}

Hopkins, D. J. ^{[1
]}

Gourdin, W. H. ^{[1
]}

Ebbinghaus, B. B. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

来源：

JOURNAL OF NUCLEAR MATERIALS | 2006年 / 355卷 / 1-3期

关键词：

D O I：

10.1016/j.jnucmat.2006.05.015

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In support of Stockpile Stewardship activities, accelerated aging tests on a plutonium alloy enriched with 7.3 at.% of Pu-238 is underway using dilatometry at 35, 50, and 65 degrees C and immersion density measurements of materials stored at 50 degrees C. Changes in density are expected from radiation damage in the lattice and helium in-growth. After 25 equivalent years of aging, the dilatometry data shows that the alloys at 35 degrees C have expanded in volume by 0.11-0.12% and have started to exhibit a near linear expansion behavior primarily caused by the helium accumulation. The average He-to-vacancy ratio from tested specimens was determined to be around 2.55. The model for the lattice damage and helium in-growth accurately represents the volume swelling at 35 degrees C. The density converted from the dilatometry corresponds well to the decreasing density trend of reference plutonium alloys as a function of time. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：142 / 149

页数：8

共 15 条

[1] Change in flow stress and ductility of δ-phase Pu-Ga alloys due to self-irradiation damage [J].