Development of magnesium-based hybrid metal matrix composite through in situ micro, nano reinforcements

Abstract

Present work aims at developing Magnesium based metal matrix composite (MMC) through in-situ reaction. In-situ generation of micro and nano particles in the Mg-melt is supposed to have a better bonding with the matrix. Ceric ammonium nitrate (CAN) is added to initial Magnesium melt (with an aim to generate CeO2 and MgO through in-situ reaction) at temperatures of 670 °C and 870 °C. The developed MMCs are solution treated to get rid of intermetallic. The nature of particles is explored with X-ray diffraction (XRD) and Energy dispersion spectroscopy (EDS). The morphology and sizes of particles are keenly jotted using scanning electron microscope (SEM). Mechanical responses of developed MMCs are recorded through Hardness, Compression and scratch tests. The compression fractured surfaces are analyzed with SEM and scratched samples are analyzed on 3 D optical profilometer to explore deformation behavior. The observations indicate the in-situ formation of CeO2, MgO and CeMg12 intermetallic phases in different types and sizes. Further, these particles are responsible for improved mechanical properties. The findings are supported by the contribution of different strengthening mechanisms.

Effect of SiC Reinforcement and Its Variation on the Mechanical Characteristics of AZ91 Composites

“…In situ composites have been developed by adding ceric ammonium nitrate (CAN) into magnesium melt at temperatures of 665 °C and 875 °C. Mechanical behaviour of developed MMCs were evaluated through compression, hardness, and scratch tests [ 18 ]. The observations reveal the formation of MgO, CeO 2 , and CeMg 12 phases in various sizes and shapes.…”

Validation of Novel Geometrically Necessary Dislocations Calculation Model Using Nanoindentation of the Metal Matrix Nanocomposite

“…These variations, along with bulk mechanical properties, have been discussed separately. [15,16] Figure 3(a) shows the SEM micrograph of the nanoparticle-rich area and nanoindentation mark in the same. The average sizes of reinforcements and volume fractions have been estimated using ImageJ software and summarized for indentation location in Fig.…”

“…[17] Local yield strength is further estimated as 360.4 MPa using an empirical relation. [2,15,18,19] 3. Discussion The mechanical properties of MMCs depend on the size and distribution of reinforcements.…”

“…In the present work, the contribution of twins has been neglected due to negligible contribution. [15,16,20] According to Clyne and Withers, [1] the strengthening mechanisms that act uniformly throughout the matrix must be added linearly and the mechanisms that act locally must be combined as the square root of the sum of squares. Sanaty-Zadeh [9] and Tahreen et al [3] discussed various methods to estimate the strength of the matrix.…”

Development of specially reinforced magnesium composites prepared by squeeze casting process

“…But due to their poor creep resistance behavior at high temperatures, the application of magnesium and its alloys are limited. So to overcome these limitations and to improve the properties, reinforcements are incorporated [9][10]. Dinaharan et al [11] reinforced titanium particles (0, 7, 14, and 21 vol %) into an AZ31 magnesium alloy by friction stir processing method.…”