Preparation and Properties of Hot-pressed Al2O3/Al-steel Mesh-Al Laminated Composites

doi:10.15541/jim20140410

Abstract

Abstract:

Al₂O₃/Al-steel mesh-Al laminated composites with “sandwich” Al-steel mesh-Al layer as interlayer, which was consisted of two Al foils and one steel mesh, were prepared by vacuum hot pressing at 580℃ and 1.5 MPa. The results indicate that the interface of Al₂O₃/Al is bonded tightly and no reaction is observed. Intermetallic compound (IMC) is detected in Al/steel interface which improves the connection conditions between the steel and Al. The laminated composites have much higher fracture toughness, work-of-fracture than that of the Al₂O₃ monolith, as well as having a close strength to Al₂O₃. Crack blunting and arresting, crack bridging, interface debonding, and ductile deformation of “sandwich” Al-steel mesh-Al layer are the main reasons for improving the toughness and work-of-fracture of laminated composites. Low-velocity impact results suggest that the Al₂O₃/Al-steel mesh-Al laminated composites have good impact resistance.

Key words: alumina, Al-steel, hot pressing, laminated composites, mechanical properties, low-velocity impact

CLC Number:

TQ174

BAI Ming-Min, LI Wei-Xin, LI Yan-Hui, ZHAO Wei, RAO Ping-Gen. Preparation and Properties of Hot-pressed Al₂O₃/Al-steel Mesh-Al Laminated Composites[J]. Journal of Inorganic Materials, 2014, 29(12): 1339-1344.

Figures/Tables 10

Table 1 Properties of steel meshes and Al foil

Samples	Thickness/µm	Diameter of steel wire/µm	Tensile strength/MPa	Melting temperature/℃
60# steel mesh	222	146	78.8±4.2	1500-1600
200#steel mesh	122	85	116.2±9.2
400#steel mesh	103	59	107.0±4.1
Al foil	100	-	59.7±5.5	660

Fig. 1 Schematic illustration of the laminated composites

Fig. 2 Optical micrograph and SEM images of the laminated composites (a) Optical micrograph image; (b) Mesoscale image; (c) Interface of Al2O3/Al; (d) Interface of Al/steel

Fig. 3 EDS surface analysis of metal interlayer

Table 2 Mechanical properties of laminated composites

Samples	Bending strength σ/MPa	Fracture toughness K_Ic/(MPa·m^1/2)	Work-of-fracture γ/(J·m^-2)	Bond strength BS/MPa
Al₂O₃	300±24	-	13±3	-
A/Al-60-Al	241.3±6.6	14.1±1.1	3066.5±395.5	22.3±1.9
A/Al-200-Al	254.2±10.7	15.5±1.4	3844.4±406.2	43.9±1.5
A/Al-400-Al	255.4±9.1	12.8±1.3	2959.2±224.3	22.9±1.2

Fig. 4 Load-displacement curves in 3-point bend test of A/Al-60-Al, A/Al-200-Al and A/Al-400-Al

Fig. 5 Single macroscopic crack propagating in notched lamin-ated composite during three-point bending test

Table 3 Impact parameters for impacted specimens

Samples	Impact energy/J	Peak load, P_i/kN	Time to peak load, T_i/ms	Deflection at peak load, D_i/mm	Absorbed energy at peak load, E_i/J	Absorbed energy, E/J	Damage situation
A/Al-60-Al	15	6.23	0.22	0.44	1.41	13.5	Penetrated
A/Al-200-Al	15	6.47	1.77	2.58	12.20	15.0	Not penetrated
A/Al-400-Al	15	7.07	0.31	0.62	1.88	15.0	Not penetrated

Fig. 6 Photos of the top, bottom surface and optical micrographs of cross-section of samples impacted at 15 J (a) A/Al-60-Al (b) A/Al-200-Al

Fig. 7 Load vs time and energy vs time for A/Al-60-Al and A/Al-200-Al specimens impacted at 15 J

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Preparation and Properties of Hot-pressed Al₂O₃/Al-steel Mesh-Al Laminated Composites

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