MATER

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MMC
Matrix Reinforcement
•Ceramics
•High Entropy Alloys
•Hybrid
•Aluminium
•Magnesium
•Copper
• Metal Matrix Composite (MMC) is composite material with at least two
constituent parts, one being a metal.
• MMCs are made by dispersing a reinforcing material into a metal matrix.
• Aluminium Matrix Composite (AMC) are in which reinforcements of ceramics,
high entropy alloys and combination of them are done to improve aluminium
mechanical properties.
Introduction
Figure1 : Metal Matrix Composite (MMC) Components

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Mechanical Properties
[5] Kaiguang Luo, Hanqing Xiong, Yun Zhang, Hao Gu, Zhide Li, Charlie Kong,
Hailiang Yu,“AA1050 metal matrix composites reinforced by high-entropy
alloy particles via stir casting and subsequent rolling”, Journal of Alloys and
Compounds, Volume 893, 2022, 162370, ISSN 0925-8388
• The hardness of the samples improved upon
HEAp addition at as cast condition .
• The hardness of the 3 weight percent specimen
was lower than that of the 1 weight percent
specimen.
• With the HEAp addition, the tensile strength of
the 1 weight percent sample hardly increased,
while that of the 3 weight percent sample
decreased to some extent, and the elongation
decreased.
Figure 8 : Effect of HEA wt% on
(a) hardness and (b) tensile strength

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After Hot, Room Temperature and Cryo rolling
[5] Kaiguang Luo, Hanqing Xiong, Yun Zhang, Hao Gu, Zhide Li, Charlie Kong, Hailiang Yu,“AA1050 metal matrix composites
reinforced by high-entropy alloy particles via stir casting and subsequent rolling”, Journal of Alloys and Compounds, Volume
893, 2022, 162370, ISSN 0925-8388
• The hardness of the specimens subjected to cryorolling(CR) and room
temperature rolling(RR) was significantly higher than that of the hot-
rolled(HR) specimen at both natural ageing and artificial ageing.
Figure 9 : Hardness at natural
ageing (NA)
Hardness at artificial ageing (AA)

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Materials and Method
• The aluminum alloy 2024 (Matrix) and Al0.5CoCrFeNi (HEAp)
reinforcement used.
• Stir casting method, AA2024 melted at 820˚C with resistance furnace
and HEAs
• Ingots of wt% 0, 1, 3, 6, and 10 were prepared.
• Ingots were cut into sheets, processed by RTR (30˚C) and CR(-195˚C).
• Hardness and tensile test.
• SEM was used for microstructures, and tensile fracture morphologies.
• EDS was used for to detect the elemental and phase distributions of
the AA1050 −HEAp MMCs.
[6] Zhide Li, Yun Zhang, Hanqing Xiong, Charlie Kong & Hailiang Yu (2022) Fabrication of particle-reinforced aluminum
alloy composite: role of casting and rolling, Materials and Manufacturing Processes, 37:1, 90-98

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Mechanical properties
• The hardness values of the AA1050 −HEAp MMCs were significantly
improved after the addition of HEAp
• At Cryorolling(CR) hardness found to be increased as compare to RTR.
[6] Zhide Li, Yun Zhang, Hanqing Xiong, Charlie Kong & Hailiang Yu (2022) Fabrication of particle-reinforced aluminum alloy
composite: role of casting and rolling, Materials and Manufacturing Processes, 37:1, 90-98
69.2
55.2
40.7
26.3
Figure 12 : Vickers hardness (a) as-cast AA1050 −HEAp MMCs (b) rolled AA1050 −HEAp MMCs

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Findings
• After adding 3wt% HEAp the UTS of as-cast AA1050−HEAp MMCs
was 115 Mpa which is improved by 74.3% when no HEAp addition.
• Mechanical properties like hardness and strength of CR
AA1050−HEAp MMCs were better than RTR.

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References
[1] J. Yeh et al., Nanostructured high-entropy alloys with multiple principal elements: novel alloy
design concepts and outcomes. Adv. Eng. Mater. 6(5), 299–303 (2004)
[2] J. Li, W. Jia, J. Wang, H. Kou, D. Zhang, E. Beaugnon, Enhanced mechanical properties of a CoCrFeNi
high entropy alloy by supercooling method. JMADE 95, 183–187 (2016)
[3] Alshataif, Y.A., Sivasankaran, S., Al-Mufadi, F.A. et al. Manufacturing Methods, Microstructural and
Mechanical Properties Evolutions of High-Entropy Alloys: A Review. Met. Mater. Int. 26, 1099–1133
(2020)
[4] Bhoi NK, Singh H, Pratap S. Developments in the aluminum metal matrix composites reinforced by
micro/nano particles – A review. Journal of Composite Materials. 2020;54(6):813-833.
[5] Kaiguang Luo, Hanqing Xiong, Yun Zhang, Hao Gu, Zhide Li, Charlie Kong, Hailiang Yu,“AA1050 metal
matrix composites reinforced by high-entropy alloy particles via stir casting and subsequent rolling”,
Journal of Alloys and Compounds, Volume 893, 2022, 162370, ISSN 0925-8388
[6] Zhide Li, Yun Zhang, Hanqing Xiong, Charlie Kong & Hailiang Yu (2022) Fabrication of particle-
reinforced aluminum alloy composite: role of casting and rolling, Materials and Manufacturing
Processes, 37:1, 90-98
[7] B.S. Murty, J.-W. Yeh, S. Ranganathan, P.P. Bhattacharjee, High-Entropy Alloys (Elsevier, Amsterdam,
2019)