Investigations into the slip behavior of zirconium diboride

Abstract

Abstract

Microstructure characterization of high‐pressure induced texture in fully densified zirconium diboride ceramics

“…However, it is reported 21,22 that the value of critical resolved shear stress for slip on $$( {0001} )\ \langle 11\bar{2}0$$〉 (basal $$\langle a\rangle $$ slip) is the lowest when deforming single‐crystal ZrB 2 plastically at elevated temperatures (above 1500°C), which makes it easier for basal $$\langle a\rangle $$ slip to active. Polycrystal ZrB 2 result 23 is consistent with the single‐crystal results. Furthermore, in ZrB 2 , the interplanar spacing of (0001) basal plane is the largest and the generalized stacking fault energy of basal $$\langle a\rangle $$ slip is the lowest, implying that basal $$\langle a\rangle $$ slip is reasonable to be the dominant slip system 23 .…”

“…Polycrystal ZrB 2 result 23 is consistent with the single‐crystal results. Furthermore, in ZrB 2 , the interplanar spacing of (0001) basal plane is the largest and the generalized stacking fault energy of basal $$\langle a\rangle $$ slip is the lowest, implying that basal $$\langle a\rangle $$ slip is reasonable to be the dominant slip system 23 . Hence, the slip plane of the dislocations shown in Figure 4 is probable (0001), by combining the previous and present results.…”

High‐temperature reactive synthesis of the Zr–Ta multiboride with a supercomposite structure

“…Hence, it would be safe to assume that these boron grains seldom observed with the plate‐like shape were the crystalized grains of the unreacted amorphous boron presumably entrapped during the cooling process. Table 1 summarizes the main features of the phases identified for the multiboride ceramic composite 14,30–42 …”

“…Table 1 summarizes the main features of the phases identified for the multiboride ceramic composite. 14,[30][31][32][33][34][35][36][37][38][39][40][41][42] F I G U R E 1 Response surface representation of the (A) room temperature flexural strength and (B) hardness using the two-step spark-plasma sintering (SPS) processing. The x-axis is the dwell being used for consolidation, whereas the y-axis is the dwell at 1400 • C that is being used at the cooling stage in order to control strain induced by the difference in the coefficient of the thermal expansion of boride phases.…”

“…Considering the reports of Refs. [1,30,31,48,73,74], a variety of fracture modes in the diborides can be connected with the orientation of the crystal plane in the grain with respect to the plane of the crack propagation as the slip system {1 0 1 0} 〈1 1 2 0〉 that should be dominant at elevated temperatures, whereas the {0 0 0 1} 〈1 1 −2 0〉 is the secondary one (Figure 9).…”