Structural evolution in Ti-Cu-Ni metallic glasses during heating

Abstract

The structural evolution of Ti50Cu43Ni7 and Ti55Cu35Ni10 metallic glasses during heating was investigated by in-situ synchrotron X-ray diffraction. The width of the most intense diffraction maximum of the glassy phase decreases slightly during relaxation below the glass transition temperature. Significant structural changes only occur above the glass transition manifesting in a change in the respective peak positions. At even higher temperatures, nanocrystals of the shape memory B2-Ti(Cu,Ni) phase precipitate, and their small size hampers the occurrence of a martensitic transformation.

Investigation of glass forming ability parameters in Hf–Cu–Ni glassy alloy

“…Although the heating rate for the present alloy (i.e. Hf-Cu-Ni) is different from the other reported alloys [9][10][11][12][13][14][15][16] significant GFA-concentration correlation has been obtained and discussed in details concerning the role of the constituting elements on GFA.…”

“…For Hf-Cu-Ni alloy in the present work heating rate was 0.17 K s −1 as reported by Khond et al [2]. The heating rate for Hf-Cu-Ni alloys [9][10][11] was 0.67 K s −1 and for Ti-Cu-Ni [12,13] heating rate was 0.50 K s −1 . Similarly for Zr-Al-Ni-Cu [14] and Cu-Ni-Zr-Ti [15] alloy heating rate was 0.67 K s −1 .…”

“…This justifies the higher values of DT , x a, g , m e, g* with the lowest Cu content in Hf−Cu−Ni glassy alloy in the present work as shown in table 1. These observations are compared with ternary Hf−Cu−Ni [9][10][11], Ti−Cu−Ni [12,13] alloys and quaternary Zr−Cu−Ni−Al [14], Cu−Ni−Zr−Ti [15] alloys. As shown in table 2, It can be seen that for Hf 60 Cu 20 Ni 20 , Tg was found to be 739 K with the highest γ * as 1.850 [9][10][11] having less Cu concentration.…”

Experimental studies of shear bands in Zr-Cu metallic glass

“…Bulk metallic glasses (BMGs) have attracted considerable attraction as structural materials due to their high strength and superior elasticity [1][2][3][4][5][6]. At room temperature, inelastic deformation behaviour in BMGs are strongly governed by the formation of shear bands (SBs), making an investigation of their origin, evolution and properties a pre-condition for interpretation of mechanisms of plastic deformation of BMGs [7,8].…”

Metallic glass formation in Cu–Ni–Ti (Zr, Hf) systems studied by thermodynamic calculations

“…1, the related experimental results were collected and are shown as red dots. 7,[16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] From Fig. 1, one can see that these experimentally measured glass formation compositions mostly fall within the predicted GFR for the Cu-Ni-Zr (Hf) systems, suggesting that the results predicted by Miedema's model and Alonso's method are acceptable in determining the glass formation region of the Cu-Ni-Zr (Hf) ternary systems.…”