Abstract
Experimental study results for thermal fatigue fracture of sand-glass specimens from a ZhS32 single-crystal alloy with different crystallographic orientations are presented over a wide range of maximum and minimum cycle temperature variations. Crystallographic, fractographic, and finite element data were used to identify crystallographic and noncrystallographic fracture modes of a single-crystal alloy. The noncrystallographic mode is realized at high maximum cycle temperatures and comparatively narrow temperature ranges. It is characterized by mode I crack growth. The crystallographic mode is realized at lower maximum temperatures and a wide range of cycle temperature variations. It is characterized by combined I–II mode crack growth in crystallographic plane {111}. The chart of fracture mechanisms in the maximum temperature-temperature range coordinates is proposed. The boundary between the regions permits of approximation, corresponding to the Arrhenius equation.
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