Transient Liquid Phase Bonding of Ti-6Al-4V and Mg-AZ31 Alloys Using Zn Coatings

Abdulaziz AlHazaa; Ibrahim Alhoweml; Muhammad Ali Shar; Mahmoud Hezam; Hany Sayed Abdo; Hamad AlBrithen

doi:10.3390/ma12050769

Transient Liquid Phase Bonding of Ti-6Al-4V and Mg-AZ31 Alloys Using Zn Coatings

Materials (Basel). 2019 Mar 6;12(5):769. doi: 10.3390/ma12050769.

Authors

Abdulaziz AlHazaa^{1

2}, Ibrahim Alhoweml³, Muhammad Ali Shar⁴, Mahmoud Hezam⁵, Hany Sayed Abdo^{6

7}, Hamad AlBrithen^{8

9

10}

Affiliations

¹ Research Chair for Tribology, Surface, and Interface Sciences, Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia. aalhazaa@ksu.edu.sa.
² King Abdullah Institute for nanotechnology, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia. aalhazaa@ksu.edu.sa.
³ Research Chair for Tribology, Surface, and Interface Sciences, Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia. ialhoweml@ksu.edu.sa.
⁴ King Abdullah Institute for nanotechnology, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia. mashar@ksu.edu.sa.
⁵ King Abdullah Institute for nanotechnology, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia. mhezam@ksu.edu.sa.
⁶ Center of Excellence for Research in Engineering Materials (CEREM), King Saud University, P.O. Box-800, Riyadh 11421, Saudi Arabia. habdo@ksu.edu.sa.
⁷ Mechanical Design and Materials Department, Faculty of Energy Engineering, Aswan University, Aswan 81521, Egypt. habdo@ksu.edu.sa.
⁸ Research Chair for Tribology, Surface, and Interface Sciences, Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia. Brithen@ksu.edu.sa.
⁹ King Abdullah Institute for nanotechnology, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia. Brithen@ksu.edu.sa.
¹⁰ National Center for Nanotechnology, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh 11442, Saudi Arabia. Brithen@ksu.edu.sa.

Abstract

Ti-6Al-4V and Mg-AZ31 were bonded together using the Transient Liquid Phase Bonding Process (TLP) after coating both surfaces with zinc. The zinc coatings were applied using the screen printing process of zinc paste. Successful bonds were obtained in a vacuum furnace at 500 °C and under a uniaxial pressure of 1 MPa using high frequency induction heat sintering furnace (HFIHS). Various bonding times were selected and all gave solid joints. The bonds were successfully achieved at 5, 10, 15, 20, 25, and 30 min. The energy dispersive spectroscopy (EDS) line scan confirmed the diffusion of Zn in both sides but with more diffusion in the Mg side. Diffusion of Mg into the joint region was detected with significant amounts at bonds made for 20 min and above, which indicate that the isothermal solidification was achieved. In addition, Ti and Al from the base alloys were diffused into the joint region. Based on microstructural analysis, the joint mechanism was attributed to the formation of solidified mixture of Mg and Zn at the joint region with a presence of diffused Ti and Al. This conclusion was also supported by structural analysis of the fractured surfaces as well as the analysis across the joint region. The fractured surfaces were analyzed and it was concluded that the fractures occurred within the joint region where ductile fractures were observed. The strength of the joint was evaluated by shear test and found that the maximum shear strength achieved was 30.5 MPa for the bond made at 20 min.

Keywords: Mg alloy; TLP Bonding; Ti alloy; Zinc; coatings; shear strength.