Internal friction and brittle-ductile transition in structural materials

Synthesis, mechanical and thermal properties of a damage tolerant ceramic: β-Lu2Si2O7

“…The internal friction data, which is also referred to as the mechanical loss spectrum, can be used to obtain the brittle to ductile transition temperature (BDTT) of ceramics. Kardashev [40] suggested that the exponential increase of internal friction corresponded exactly to the BDTT. Using linear fits of the internal friction data at various temperature ranges, the BDTT is found to be about 1320 • C. Damping mechanisms are positive factors for improving toughness in hard and brittle materials.…”

Theoretical and experimental determination of the major thermo-mechanical properties of RE 2 SiO 5 (RE = Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y) for environmental and thermal barrier coating applications

“…As indicated in Fig. 5, the BDTTs of X2-RE 2 SiO 5 are determined using the method proposed by Kardashev [28], and the results are shown in Fig. 6 segregation.…”

“…Exponential increases in internal friction are accompanied by decreases in Young's moduli at high temperatures, thus accounting for the so-called "brittle-to-ductile" transition in ceramic materials [27]. Kardashev [28] suggested that exponential increases in internal friction correspond to the BDTT. The BDTT can be determined by linear fitting of the internal friction data at various temperature ranges.…”

Investigation of oxygen-titanium interaction in vanadium by internal friction method

“…These problems gave rise to numerous studies devoted to investigating the relation between the embrittle ment processes and physico mechanical properties of bcc metals [5][6][7]. Thus, upon investigating the EK 181 ferritic martensitic steel and V-4Cr-4Ti alloy, the correlation between the change in the impact duc tility and the amplitude independent internal friction [6] was established; this fact confirms the important role of impurities in the embrittlement of bcc materials [1].…”