Hardness and elastic modulus of zircon as a function of heavy-particle irradiation dose: I.In situα-decay event damage
作者:
B.C. Chakoumakos,
W.C. Oliver,
G.R. Lumpkin,
R.C. Ewing,
期刊:
Radiation Effects and Defects in Solids
(Taylor Available online 1991)
卷期:
Volume 118,
issue 4
页码: 393-403
ISSN:1042-0150
年代: 1991
DOI:10.1080/10420159108220764
出版商: Taylor & Francis Group
关键词: α-decay damage;crystalline-to-amorphous transition;elastic modulus;hardness;mechanical properties microprobe;metamict;zircon
数据来源: Taylor
摘要:
For a natural single crystal of zircon, ZrSiO4, from Sri Lanka, exhibiting zonation in U and Th contents, the hardness and elastic modulus have been determined as a function of α-decay dose using a mechanical properties microprobe (MPM). The zones vary in thickness from one to hundreds of micrometers, and have uranium and thorium concentrations such that the α-decay dose varies between 2 × 1015and 1 × 1016α-decay events/mg (0.15 to 0.65 dpa, displacement per atom). The transition from the crystalline to the aperiodic metamict state occurs over this dose range. For a traverse of 75 indent pairs across layers sampling a large portion of the crystalline-to-metamict transition (3.7 × 1015to 9.7 × 1015α-decay events/mg) both the hardness and elastic modulus decrease linearly with increasing α-decay dose. The radiation-induced softening follows a behavior similar to other radiation-induced changes, that is with the expansion of the unit cell parameters there is a decrease in density, birefringence, hardness and bulk modulus.
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