DAMAGE STRUCTURES IN FAST-NEUTRON IRRADIATED MAGNESIUM ALUMINATE AND ELECTRON-IRRADIATED ALUMINUM OXYNITRIDE SPINELS

被引：31

作者：

PARKER, CA

HOBBS, LW

RUSSELL, KC

CLINARD, FW

机构：

[1] MIT,DEPT NUCL ENGN,CAMBRIDGE,MA 02139

[2] UNIV CALIF LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545

来源：

JOURNAL OF NUCLEAR MATERIALS | 1985年 / 133卷 / AUG期

关键词：

Spine1 structure ceramics are attractive for fusion insulator applications; because they appear to be resistant to radiation damage [l]. Since they have a cubic unit cell; spine1 grains in polycrystalhne material should swell isotropically; which minimizes the tendency for grain boundary decohesion. By contrast; polycrystalline alumina with a hexagonal cell is known to fail at the grain boundaries when it swells anisotropically [2]. Ceramics with complex structure (large unit cell) are; as a rule; more resistant to radiation effects [3]. probably because it is difficult to nucleate defect aggregates within them. With high melting points (> 2000 K). spine1 ceramics have slow diffusion rates at typical irradiation temperatures; and are therefore expected to be resistant to defect aggregation. Here; we report on investigations of radiation effects in two spine1 structure ceramics: aluminum oxynitride (ALON) and magnesium aluminate; henceforth referred to as MAS. Clinard et al. [2] and Hobbs and Clinard [l] found that magnesium aluminate undergoes little. if any. swelling under neutron irradiation. Hurley and Bunch [4] further showed that MAS should retain good thermal shock resistance under irradiation. because its thermal conductivity is not severely degraded (less than 50% decrease) by neutron damage. On the other hand. early work by Patrick [5] indicated MAS swelled severely under irradiation. We suspect modern processing and high purity materials are required for good radiation resistance. Strength and toughness are somewhat increased by moderate irradiation; according to Hurley et * Separate contributions to this work were respectively sup-ported by the US National Science Foundation (CAP and KCR) under grant DMR83-15372 and the US Department of Energy (LWH and FWC) under contracts DE-AC02-83ER45015 and W-7405-ENG-36;

D O I：

10.1016/0022-3115(85)90248-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

引用

页码：741 / 744

页数：4

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