Microstructural Evolution and Mechanical Properties of Laminated CuAl Composites Processed by Accumulative Roll-Bonding and Annealing

doi:10.1007/s40195-020-01179-w

Abstract

Abstract:

Nanostructured Cu-/Al-laminated composites were processed by accumulative roll-bonding (ARB) technique for four cycles. Microstructural evolutions inside the Cu and Al layers and the interfacial reactions were revealed after annealing at different temperatures. Recovery and recrystallization occurred in the Cu and Al layers at low annealing temperatures, and three kinds of intermetallic compounds formed near the interfaces. The mechanical properties of these composites after annealing were investigated by tensile tests, and the variation of strength-ductility synergy was comprehensively discussed by considering the roles of constituent and the intermetallic compounds.

Key words: CuAl composites, Accumulative roll-bonding (ARB), Annealing, Intermetallic compounds, Ductility

H.R. Lin, Y. Z. Tian, S.J. Sun, Z.F. Zhang. Microstructural Evolution and Mechanical Properties of Laminated CuAl Composites Processed by Accumulative Roll-Bonding and Annealing[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(7): 925-931.

Figures/Tables 8

Fig. 1 SEM observations on RD-ND planes of specimens: a ARB, d ARB200, b, e ARB300, c, f ARB400, e, f high magnificent zone of interlayers

Table 1 EDS results of points in Fig. 1

Spot	Layer	Elemental composition (at.%)		IMC
Spot	Layer	Cu	Al	IMC
1	Cu layer	95.45	4.55
2	Cu layer	88.02	11.98
3	Layer 1	62.52	37.48	Al₄Cu₉
4		58.73	41.27
5		55.78	44.22
6	Layer 2	47.90	52.10	AlCu
7	Layer 2	53.03	46.97	AlCu
8	Layer 3	30.81	69.19	Al₂Cu
9		30.87	69.13
10		26.19	73.81
11	Al layer	1.35	98.65
12	Al layer	1.32	98.68

Fig. 2 XRD results of specimens processed by ARB and heat treatment at 400 °C

Fig. 3 ECC images of ARB specimen of a Al layer and e Cu layer; EBSD results of specimens processed by ARB and thermal annealing at b, f 200 °C, c, g 300 °C, d, h 400 °C

Fig. 4 a Tensile engineering stress-strain curves of the specimens processed by ARB and subsequent thermal annealing; interfaces between Cu and Al layers of b ARB200, c ARB300 specimens at necking point

Fig. 5 EBSD maps of ARB200 and ARB300 specimens at necking points: a IPF, b KAM maps of ARB200 specimen, c IPF, d KAM maps of ARB300 specimen

Fig. 6 Fracture morphologies on ND-TD planes of a, e ARB, b, f ARB200, c, g ARB300, d, h ARB400 specimens

Table 2 EDS results of points in Fig. 6

Spot	Elemental composition (at.%)		Possible compounds
Spot	Cu	Al	Possible compounds
1	63.7	36.3	AlCu
2	50.57	49.43	AlCu
3	57.78	42.22	AlCu
4	73.37	26.63	Al₄Cu₉
5	75.23	24.77	Al₄Cu₉
6	77.79	22.21	Al₄Cu₉
7	94.32	5.68	Cu
8	71.18	28.82	Al₄Cu₉
9	57.72	42.28	AlCu

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