Fabrication of Magnesium–NiTip Composites via Friction Stir Processing: Effect of Tool Profile

N Gangil,S.M.A.K Mohammed,S Maheshwari,A.N Siddiquee,D.L Chen,D Singh,H Nagar

doi:10.3390/met10111425

N Gangil, S.M.A.K Mohammed + Show 5 more

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https://doi.org/10.3390/met10111425

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Abstract

In this study, a solid-state fabrication route via friction stir processing (FSP) was used to fabricate Nitinol particulate (NiTip)-reinforced magnesium-based composites to avoid the diffusion reaction and the formation of brittle interfacial compounds. The effect of four tool profiles on the homogeneity in the dispersion of NiTip particles in the magnesium matrix and microhardness was examined and analyzed. A counter-clockwise scrolled shoulder with a plain cylindrical pin and three tools with a flat shoulder having plain cylindrical pin, left-hand, and right-hand threaded pins were used and compared. The tool profiles were observed to exhibit a significant influence on the microstructure of the fabricated Mg/NiTip composites. A wider and more uniform distribution of NiTip particles along with superior bonding with magnesium matrix was achieved with a left-hand threaded cylindrical pin tool. The incorporation of NiTip gave rise to a significant increase in the microhardness of the fabricated composites due to a variety of strengthening mechanisms.

Highlights

Nickel–titanium (NiTi) alloy, called as Nitinol, is a popular shape memory alloy (SMA).SMA is being recognized as a smart material because of its typical shape memory effect (SME): a unique property that enables them to “memorize” their shape when exposed to specific external stimulus such as thermal, mechanical, and electromagnetic vibrations [1,2]
Friction stir processing was effective in the fabrication of Nitinol particulate (NiTip) SMA-reinforced magnesium-based p SMA-reinforced magnesiumFriction Microstructural stir processing was effective in the fabrication of NiTi composites
Microstructural characterization together with an indentation test was carried out identify the role of tool profiles in the fabrication of Mg–NiTip composites

Summary

Introduction

Nickel–titanium (NiTi) alloy, called as Nitinol, is a popular shape memory alloy (SMA).SMA is being recognized as a smart material because of its typical shape memory effect (SME): a unique property that enables them to “memorize” their shape when exposed to specific external stimulus such as thermal, mechanical, and electromagnetic vibrations [1,2]. SMA demonstrates a unique amalgamation of properties such as super-elasticity, SME, good resilience, vibration damping and mechanical properties, compactness, and lightness, which makes it different from the other alloy systems [3,4]. Likewise, these unique properties can be carried forward if the SMAs are implanted in a base matrix to form composites. These unique properties can be carried forward if the SMAs are implanted in a base matrix to form composites It is a favorite type of engineering materials and finds important applications in the field of driving, sensing, vibration damping, and structural and biomedical applications [5,6].

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