Enhanced Mechanical Properties of AA5083 Matrix Composite via Introducing Al0.5CoCrFeNi Particles and Cryorolling

doi:10.1007/s40195-021-01351-W

Abstract

Abstract:

High-entropy alloy particles (HEAPs) can markedly enhance the mechanical properties of metal matrix composites (MMCs). In this study, AA5083/Al_0.5CoCrFeNi HEAPs MMCs with different HEAPs contents (0, 1, and 3 wt%) were prepared via a stir-casting, and then these MMCs sheets were hot rolled (573 K) and cryorolled (77 K), respectively. The mechanical properties of the MMCs sheets were measured by tensile testing and microhardness test. Additionally, their microstructures were analyzed by scanning electron microscopy and transmission electron microscopy. Results revealed that the ultimate tensile strength (UTS) of the as-cast AA5083/Al_0.5CoCrFeNi HEAPs MMCs were improved from 203 to 257 MPa by adding 3 wt% HEAPs. And the mechanical properties of the MMCs sheets were improved after cryorolling. After cryorolling with 50% rolling reduction ratio, the MMCs with 1 wt% HEAPs had an UTS of 382 MPa, which was 1.9 times that of the MMCs before rolling. Finally, the strengthening mechanisms of HEAPs and cryorolling on the AA5083/HEAPs MMCs were discussed.

Key words: Metal matrix composite, Cryorolling, Mechanical properties, High-entropy alloy particle

Hao Gu, Zhide Li, Kaiguang Luo, Laxman Bhatta, Hanqing Xiong, Yun Zhang, Charlie Kong, Hailiang Yu. Enhanced Mechanical Properties of AA5083 Matrix Composite via Introducing Al_0.5CoCrFeNi Particles and Cryorolling[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(6): 879-889.

Figures/Tables 12

Fig.1 Illustration of the fabrication of AA5083/Al0.5CoCrFeNi HEAPs MMCs

Table 1 Chemical composition of AA5083 (wt%)

Mg	Mn	Fe	Si	Cr	Zn	Al
4.28	0.63	0.17	0.22	0.12	0.25	Bal.

Table 2 Chemical composition of Al0.5CoCrFeNi high-entropy alloy particles (wt%)

Al	Co	Cr	Fe	Ni
5.65	21.76	24.66	23.37	24.56

Fig. 2 SEM-EDS spectrum of AA5083/Al0.5CoCrFeNi HEAPs MMCs with 3 wt% HEAPs

Fig. 3 SEM images and grain size distribution of as-cast a AA5083 and AA5083/Al0.5CoCrFeNi HEAPs MMCs with b 1 wt% and c 3 wt% HEAPs

Fig. 4 SEM images of HEAPs in a as-cast, b CR-0.4 mm AA5083/Al0.5CoCrFeNi HEAPs MMCs with 3 wt% HEAPs

Table 3 Tensile mechanical properties of as-cast materials

Materials	σ_YS (MPa)	σ_UTS (MPa)	El (%)
AA5083	120 ± 6	203 ± 13	23.0 ± 1.7
MMCs with 1 wt% HEAPs	146 ± 7	218 ± 9	15.0 ± 0.9
MMCs with 3 wt% HEAPs	207 ± 11	257 ± 14	11.7 ± 1.9

Fig. 5 Mechanical properties of AA5083 and AA5083/Al0.5CoCrFeNi HEAPs MMCs via HR and CR. a UTS, b elongation to fracture, and c microhardness of the MMCs with different mass fraction of HEAPs

Fig. 6 Fracture surface of as-cast a AA5083, b AA5083/Al0.5CoCrFeNi HEAPs MMCs with 3 wt% of HEAPs, and AA5083 subjected to c HR and d CR with 80% rolling reduction ratio, and the MMCs with 3 wt% HEAPs subjected to e HR and f CR with 80% rolling reduction ratio

Fig. 7 Mechanical properties of AA5XXX matrix composites

Fig. 8 Illustration of strengthening mechanism and microstructural evolution of materials during rolling. As-cast a AA5083 and b AA5083/HEAPs MMCs, rolled c AA5083, d AA5083/HEAPs MMCs

Fig. 9 TEM images of the 0.4-mm AA5083/Al0.5CoCrFeNi HEAPs MMCs with 3 wt% HEAPs by CR: a microstructure near a HEAP, b Al matrix

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