High-temperature deformation of calcite single crystals by r+ and f+ slip
High-temperature deformation of calcite single crystals by r+ and f+ slip
复制标题
r 和 f 滑移对方解石单晶的高温变形
DOI：
10.1144/gsl.sp.1990.054.01.25
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
C. Spiers
中科院分区：
文献类型：
--
作者：
J. D. Bresser;C. Spiers
Abstract Optical quality calcite single crystals have been uniaxially compressed at constant strain rates and temperatures (T) in the range 3 × 10−4 to 3 × 10−7 s−1 and 550–800°C respectively. The tests were performed with the compression direction parallel to [4041], i.e. parallel to the intersection of two cleavage rhombs. At strains above 1% strain, steady state flow was observed at T ≥ 600°C. The flow stresses at these temperatures were found to be rather insensitive to strain rate, and can be empirically described by a power law creep equation with a stress exponent ranging from c. 13 at 600°C to c. 9.5 at 700–800°C. The active glide systems were identified by slip line analysis. The crystals were found to deform by e-twinning at T < 600°C, and by slip on a single r<2021> system plus a single f system in the so-called positive sense at T ≥ 600°C. The effective slip direction on the active f-plane was of <1011> type rather than the <0221> type reported previously. The observed creep behaviour in the slip dominated regime has been compared with microphyical models. The deformation behaviour seems best explained by cross slip or glide-controlled creep models, or a combination of these.
