VOID FORMATION IN MAGNESIUM ALUMINATE SPINEL HEAVILY IRRADIATED WITH FAST-NEUTRONS

被引:16
作者
FUKUMOTO, KI
KINOSHITA, C
GARNER, FA
机构
[1] KYUSHU UNIV, DEPT NUCL ENGN, HIGASHI KU, FUKUOKA 81281, JAPAN
[2] PACIFIC NW LAB, DEPT MAT SCI, RICHLAND, WA 99352 USA
关键词
VOID FORMATION; MAGNESIUM ALUMINATE SPINEL; SINGLE CRYSTAL; NEUTRON IRRADIATION; SWELLING; CAVITY; DISLOCATION LOOP; STACKING FAULT; CERAMICS; RADIATION RESISTANCE; RADIATION DAMAGE; MEV RANGE 0.1-10; TEMPERATURE RANGE 500-1500K;
D O I
10.3327/jnst.32.773
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
Single crystals of magnesium aluminate spinel (MgAl2O4) were heavily irradiated to fission neutron fluences from similar to 1X10(26) to similar to 2X10(27) n/m(2) (E>0.1 MeV) at 658 and 1,023 K in FFTF (Fast Flux Test Facility) to investigate their microstructural evolution under heavy neutron irradiation and to confirm their previously observed resistance to void swelling. At 658 K no voids were observed up to 2.29 x 10(27) n/m(2), but 1/4[110] interstitial loops were formed. These loops changed their habit planes from (111) to (110) with increasing neutron fluence. At 1,023 K the 1/4[110]; type of interstitial loops grew to form stacking fault networks composed of stacking faults on each of the six equivalent {110} planes. Tiny voids were also observed to form preferentially on or near stacking faults after 1.37X10(27) n/m(2). A limited number of very small cavities, contributing to a volumetric swelling of only 0.07%, were also observed in the crystal matrix after 2.17x10(27) n/m(2). The possible mechanisms of suppression of void formation in MgAl2O4 are discussed.
引用
收藏
页码:773 / 778
页数:6
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