On the nature of low temperature internal friction peaks in metallic glasses

Hydrogen Internal Friction Peak in Amorphous Zr-Cu-Al-Si Alloys

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] One reason is that the observed relationship between T p and C H and that between Q −1 p and C H show variety among various a-alloys, suggesting that the detailed anelastic process for the HIFP is a function of the chemical composition of a-alloys. For the later-transition-metal/earlytransition-metal a-alloys, the anelastic reorientation of hydrogen atoms sitting in tetrahedral sites may be responsible for the HIFP.…”

“…The pronounced HIFP can be observed in the a-alloys which contain much hydrogen in solution, where the anelastic reorientation relaxation of hydrogen in a-alloys is responsible for the HIFP in most a-alloys. [2][3][4][5][6][7][8][9][10][11][12][13][14] A recent review for the HIFP in a-alloys com- * Graduate Student, University of Tsukuba. p data reported for metal-metal a-alloys and metal-metalloid a-alloys, where T p and Q −1 p denote the temperature and the height of the HIFP, respectively.…”

Internal Friction of Metallic Glasses : Mechanisms and Conditions of their Realization

“…In both cases IF peaks are corresponded to a large activation volume, inconsistent with an assumption about point-like character of defects responsible for relaxation. As a whole, the results [17] coifinns the proposal about unity of nature of dissipation mneclianisms in cold deformed and l~ydrogenated MG. Further investigations in this field, however, seem to be desirable.…”

“…This staternent was argued in Ref. [17] in detail where IF temperature dependences of rolled and hydrogenated Ni60Nb40 samples were measured at identical experilnental conditions. It was shown that both rolling and hydrogenation result in relaxation IF peaks on a hysteresis background, the shapes of the peaks and their temperature positions closely resernble and the activation energies are identical.…”

“…It should be pointed out in this connection that the authors [4,16,50,51] especially underlined that damping level can be critically dependent on the conditions of samples gripping. A special investigation has shown [17] that inappropriate gripping results in plastic deformation of samples and, due to this fact, in appearance of large IF peaks analogous to those described below, in Sec.4.2. However, sometimes without special experimental efforts it is impossible to determine whether these peaks are characteristic of as-cast or plastically deformed samples.…”