| Hot tensile behavior of SiC-, NbC-, and MgO-reinforced LM25 metal matrix composites for high-temperature applications |
| T. Jayakumar1, K. Annamalai2 |
1Department of Mechanical Engineering , AMET University , Chennai , Tamilnadu , India
2School of Mechanical Engineering , VIT University , Chennai , Tamilnadu , India |
|
|
|
Received: May 1, 2022; Revised: October 19, 2022 Accepted: November 16, 2022. Published online: November 29, 2022. |
|
|
|
| ABSTRACT |
|
The main aim of this research was to investigate the mechanical behavior of aluminum (LM25) alloy hybrid metal matrix composites for high-temperature applications. The L25 alloy is hybrid reinforced with varying silicon carbide (SiC), niobium carbide (NbC), and magnesium oxide (MgO) nanoparticle compositions. Hybrid particle-reinforced composites are manufactured by means of a liquid manufacturing technique. The hot tensile behavior of the LM25 matrix and hybrid composites was examined under the temperature condition 30 °C–400 °C as per ASTM B557 and ASTM E8M standards using a hot tensile test rig. In addition, the surface morphology of the LM25 alloy and SiC-, NbC-, and MgO-reinforced composites was investigated using scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDX). The results of the surface morphology investigation of the composites revealed that the SiC, NbC, and MgO particles were homogenously scattered within the matrix and revealed clearer interface bonding. In tensile test, the LM25 alloy/ 3wt% SiC, NbC, and MgO (LMSMN-3) composite showed a yield and tensile strength around 230.82 MPa and 251.71 MPa, which was 25% larger than the LM25 alloy materials, whereas LM25 alloy/1wt% SiC, NbC, and MgO (LMSMN-1) and LM25 alloy/2wt% SiC, NbC, and MgO (LMSMN-2) composites showed a yield and tensile strength of 176.45 MPa, 203.71 MPa,192 MPa, and 211.32 MPa, respectively, which was 23% and 16.75% higher than the LM25 alloy under room temperature condition. Also, at elevated temperatures such as 200ᕑ and 400ᕑ, the LMSMN-3 composite exhibited a maximum increase in the tensile properties, i.e., 48.28% at 200ᕑ and of 61.12% at 400ᕑ. |
| Key words:
LM25 alloy · Metal matrix composites · Hot tensile · High temperature · SEM/EDX · XRD |
|
|
|
PDF Links 
Full text via DOI
Download Citation 
