Activated Slip Systems in β-Silicon Nitride during High Temperature Deformation

Deformation behaviors and fracture strength of β$\ubeta$‐Si3N4 single crystals

“…In general, such contrasts have been observed typically in β-Si 3 N 4 single crystals plastically deformed at high temperatures in the previous studies. 16,18,20 Therefore, it is most likely that the formation of the strain contrasts is due to the plastic deformation, though the specimens were deformed at room temperature.…”

“…14 Transmission electron microscopy (TEM) investigations have been conducted on plastic deformation and dislocation behaviors of β-Si 3 N 4 single crystals, revealing that dislocations having 〈0 0 0 1〉 Burgers vector is most frequently identified and the primary slip plane is {10 10}. [15][16][17][18][19][20] More recently, it was reported that β-Si 3 N 4 single crystals undergo plastic deformation when the compressive stress exceeds the yield stress due to the generation and movement of dislocations in the primary slip system {1010} ⟨0001⟩ by means of micropillar compression tests. 21 However, when materials are used for structural applications, their fractures generally occur not in compression but in tension.…”

“…Microhardness and fracture toughness of the single crystals have been surveyed in relation to their crystal characteristics using indentation 13 and micro‐cantilever techniques 14 . Transmission electron microscopy (TEM) investigations have been conducted on plastic deformation and dislocation behaviors of $$\ubeta$$‐Si 3 N 4 single crystals, revealing that dislocations having 〈0 0 0 1〉 Burgers vector is most frequently identified and the primary slip plane is $$\{ 10\bar{1}0\} $$ 15–20 . More recently, it was reported that $$\ubeta$$‐Si 3 N 4 single crystals undergo plastic deformation when the compressive stress exceeds the yield stress due to the generation and movement of dislocations in the primary slip system $$\{ 10\overline 1 0\} $$$$\langle {0001} \rangle $$ by means of micropillar compression tests 21 .…”