Elucidating the role of microstructural modification on stress corrosion cracking of biodegradable Mg4Zn alloy in simulated body fluid

Deepa B Prabhu; Jayakrishnan Nampoothiri; V Elakkiya; R Narmadha; R Selvakumar; R Sivasubramanian; P Gopalakrishnan; K R Ravi

doi:10.1016/j.msec.2019.110164

Elucidating the role of microstructural modification on stress corrosion cracking of biodegradable Mg4Zn alloy in simulated body fluid

Mater Sci Eng C Mater Biol Appl. 2020 Jan:106:110164. doi: 10.1016/j.msec.2019.110164. Epub 2019 Sep 5.

Authors

Deepa B Prabhu¹, Jayakrishnan Nampoothiri¹, V Elakkiya², R Narmadha², R Selvakumar², R Sivasubramanian³, P Gopalakrishnan⁴, K R Ravi⁵

Affiliations

¹ Structural Nanomaterials Lab, PSG Institute of Advanced studies, Coimbatore 641004, Tamil Nadu, India; Departmement of Metallurgical Engineering, PSG College of Technology, Coimbatore 641004, Tamil Nadu, India.
² Tissue Engineering Laboratory, PSG Institute of Advanced studies, Coimbatore 641004, Tamil Nadu, India.
³ Electrochemical sensors and energy materials laboratory, PSG Institute of Advanced Studies, Coimbatore 641004, Tamil Nadu, India.
⁴ Departmement of Metallurgical Engineering, PSG College of Technology, Coimbatore 641004, Tamil Nadu, India.
⁵ Departmement of Metallurgical and Materials Engineering, Indian Institute of Technology, Jodhpur 342011, Rajasthan, India. Electronic address: ravikr@iitj.ac.in.

PMID: 31753353
DOI: 10.1016/j.msec.2019.110164

Abstract

This paper investigates the effect of microstructure modification by heat treatment on stress corrosion cracking (SCC) behavior of Mg4Zn alloy in simulated body fluid (SBF). Mg4Zn alloy in as cast, solution heat treated and peak aged conditions was susceptible to SCC in SBF when strained at 3.6 × 10^-6 s^-1. SCC index based on fracture energy is least for solutionized alloy (0.84), while 0.88 for as cast and peak aged alloys. Fractographic analysis indicates predominantly intergranular SCC for solution treated alloy initiated by anodic dissolution near grain boundaries. As cast and peak aged alloy shows mainly transgranular failure due to hydrogen embrittlement adjacent to secondary phase particles.

Keywords: Hydrogen embrittlement(C); Magnesium (a); SEM (B); Stress corrosion (C).

MeSH terms

Alloys / chemistry
Animals
Body Fluids / chemistry*
Corrosion
Humans
Hydrogen / chemistry
Magnesium / chemistry*

Substances

Alloys
Hydrogen
Magnesium