Mechanical spectroscopy, internal friction and ultrasonic attenuation: Collection of works

Internal Friction and Microstructure of Ti and Ti-Mo Alloys Containing Oxygen

“…Mechanical spectroscopy [6][7][8][9][10][11][12][13][14] provides important information about the behavior of interstitial atoms in binary and ternary alloys such as the concentration of dissolved interstitial atoms in solid solution, diffusivity, solubility limit [6,[14][15][16][17][18][19][20][21], precipitation, and their interaction phenomena caused by interaction between relaxing entities [22][23][24][25][26][27][28][29][30], short-and longrange interaction of mobile point defects with dislocations [31][32][33][34][35][36][37][38][39][40][41], and strain aging. In general, the time-invariant harmonic stress field imposed on a sample containing interstitial atoms dissolved in solid solution yields splitting of free-energy levels of different elastic dipoles' orientations [17].…”

“…In general, the time-invariant harmonic stress field imposed on a sample containing interstitial atoms dissolved in solid solution yields splitting of free-energy levels of different elastic dipoles' orientations [17]. This phenomenon gives rise to the classic relaxation process, which manifests (in bcc lattice) as internal friction peak known as Snoek peak [6][7]13,[15][16][17]28]. However, the relaxation mechanism of point defects in the hcp metals [6,[42][43][44][45][46][47][48] differs from the classic Snoek relaxation observed in the bcc metals [6,15].…”

Low-Frequency Mechanical Spectroscopy of Lanthanum Cobaltite Based Mixed Conducting Oxides

“…A basic understanding of the origin of ferroelastic properties is not currently available for the lanthanum cobaltite and other mixed conductors. The internal friction technique [16][17][18][19][20][21] has been proved as a very sensitive tool to investigate microscopic relaxation processes and phase transitions in perovskites [22][23][24][25][26]. In this study, we present the results of mechanical loss (internal friction) measurements on La 1-x Sr x Co(Fe)O 3-δ (0≤ x ≤0.6) ceramics.…”

Mechanical Spectroscopy Of Equal-Channel Angular Pressed Fe-Cr Alloys And Tungsten

“…In this study, the microstructural stability of equalchannel angular pressed ferritic/martensitic 9Cr1Mo steel (T91), ferritic Fe-18wt.%Cr alloy and pure W with ultrafine grain size is investigated by mechanical spectroscopy [12][13][14][15][16][17][18][19]. Internal friction (IF) peaks are measured in the ECAPstrained samples, and their mechanisms are discussed.…”