Cover Page September-2019-Advanced Materials Letters

Advanced Materials Letters

Volume 10, Issue 9, Pages 663-670, September 2019
About Cover

Materials modelling has established itself as an essential analysis not only to study the insight of complex physical phenomena appearing in the soft or condensed matter but also to realize the emerging trend of 'reverse engineering' as a keystone for technological innovations. The cover photo of this September 2019 issue describes the bio interaction between graphene and enzyme protein for bioelectronics applicable in battery, fuel cell and biosensing applications and dedicated to celebrating the 6th anniversary of Nobel Prize in Chemistry on “Multiscale models for complex chemical systems”.


Microstructure and Mechanical Characterization Study in the IN718/BNi-2/316L Joint by Transient Liquid Phase Bonding Process

M. Salmaliyan*, M. Shamanian

Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

Adv. Mater. Lett., 2019, 10 (9), pp 663-670

DOI: 10.5185/amlett.2019.0044

Publication Date (Web): Sep 03, 2019

E-mail: salmaliyan.mehran@gmail.com

Abstract

In this research, the relationship among TLP bonding microstructures, mechanical properties and fracture mechanism of IN 718 / BNi-2 /AISI 316L joint was studied. In the first step, by changing TLP variables e.g. time and bonding temperature in the range 30-60 min and 950-10500C respectively, characteristics of each type of microstructures including formation of destructive phases and homogeneity of microstructures were studied. In the second step, in order to investigate the mechanical properties and their fracture surface morphology, hardness and shear tests were accomplished. In the next stage, based on diffusion behavior of alloying elements, the relationship among microstructure, mechanical properties and fracture mechanism was studied. Results show that microstructures of bonding region were classified in three types. Type I: solid state bonding microstructure, Type II: Athermal – isothermal solidification microstructure, and Type III: isothermal solidification microstructure. It was observed that for each specific microstructure, there is one fracture mechanism or there are more that are dimples fracture resulting from precipitations within matrix, quasi-cleavage fracture resulting from dual microstructure of eutectic – isothermal solidification and dimple-tearing fracture resulting from tiny precipitations within bonding region. © VBRI Press.

Keywords

Diffusion bonding of IN 718, diffusion bonding of 316L, dissimilar welding, fracture mechanism, isothermal and Athermal solidification, transient liquid phase

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