Stoichiometry and mechanical properties of Mo3Si

Defects Interaction on the Mechanical Properties during Transition Formation of (Mo, Cr)<SUB>3</SUB>Si Intermetallic Alloys

“…A reduction of about 40% is observed in the fracture toughness between 16 and 76 Cr at.%. This reduction is approximately of 35% in comparison with the value reported for Mo 3 Si single phase [9]. It is well known that thermal vacancies may induce some grade of softening in B2 intermetallic compounds [13] and this phenomenon is referred to a solid solution addition.…”

“…Shah et al [6] investigated the intermetallics Nb 3 Al and Cr 3 Si, evaluated their mechanical properties at room and high temperature and reported that Cr 3 Si presented an excellent behavior at high temperature, but with limited possibilities of being alloyed. Raj [7] [8] evaluated the mechanical properties of Cr 3 Si and Cr-Cr 3 Si produced by arc cast and powder metallurgy, where the room temperature fracture toughness was determined in the range of 2.0 and 3.0 MPa m 1/2 , which was comparable with the value reported for Mo 3 Si [9]. Fleischer et al [10] studied the mechanical properties of similar intermetallic compounds.…”

“…Fleischer et al [10] studied the mechanical properties of similar intermetallic compounds. They reported the microhardness value of 1200 HVN at room temperature for Cr 3 Si, which was lower than the value reported for Mo 3 Si [9]. The analysis of the transition of Mo 3 Si to Cr 3 Si may provide important information about the optimal concentration of Cr to improve the ductility of the Mo 3 Si considering the thermal defects affectation.…”

Fracture and fatigue resistance of Mo–Si–B alloys for ultrahigh-temperature structural applications

“…MPa√m [13,14]. Additionally, the toughness of the current alloys is far superior to those previously reported with a discontinuous α-Mo phase; these latter materials displayed very little R-curve behavior with much lower peak toughness ranging from 4 to 7.5…”

“…By utilizing a continuous α-Mo matrix, crack trapping becomes a more potent toughening mechanism because the crack cannot bypass the α-Mo phase. As a result, the initiation toughness of these alloys ranges from 7.5 to 12 MPa√m, values up to four times higher than for unreinforced molybdenum silicides [13,14].…”