PSI - Issue 14

P. Rama Rao et al. / Procedia Structural Integrity 14 (2019) 322–329 P R Rao et al/ Structural Integrity Procedia 00 (2018) 000–000

324

3

3. Results and discussion Figure 1, shows the XRD pattern of the as-spun ribbon of Ti 20 Zr 20 Cu 50 Ni 10. It a typical broad maximum, characteristic of amorphous/glassy materials and no distinct crystalline peaks are observed within the sensitivity limits of the diffractometer. This confirms the glass formation of Ti 20 Zr 20 Cu 50 Ni 10 in the rib bon form.

1000 1200 1400 1600 1800

Ti 20 Zr 20 Cu 50 Ni 10

20 30 40 50 60 70 80 90 400 600 800

Intensity(a.u)

2theta(degree)

Fig.1. The XRD patterns of as-cast metallic glass Ti 20 Zr 20 Cu 50 Ni 10 sample.

Fig 2 (a). FESEM analysis of Ti/Ti 20 Zr 20 Cu 50 Ni 10 /Ti composite brazed joint at 990 K for a period of 10 min; Cross sectional BSE Image, Figs 2 (b-f) corresponding EDX based line scan analysis across 40µm length comprising the CP-Ti pieces on both sides of brazed joint, corresponding concentration profiles of elements: (c) Ti, (d) Ni (e) Cu and (f) Zr.

The FESEM analyses including EDX of Ti/Ti 20 Zr 20 Cu 50 Ni 10 /Ti brazed joint composites at corresponding brazing temperatures are shown in figures 2, figure3, figure 4 and figure5. Figure 2 (a) shows the cross sectional BSE image of the Ti/Ti 20 Zr 20 Cu 50 Ni 10 /Ti composite joint. It has been indicated in figure 2 (a) that the joint was devoid of imperfections (in respect of cracks and voids) and soundly bonded. It appears that there was possibly a vigorous interfacial interaction which had occurred during the brazing process and there must be a chemical reaction between the Ti substrate and molten metallic glass filler including involvement of dissolution and diffusion, S.J. Lee et al. (1998). A good wetting and strong bonding between the substrates and filler alloy has been observed from these results. The formation of sound interfacial reaction layers at the interface between the brazing alloy and