Influence of Extrusion Speed on the Microstructure Evolution, Interface Bonding and Mechanical Response of Mg MB26/Al 7075 Composite Rod

doi:10.1007/s40195-018-0838-x

Abstract

Abstract:

The Mg MB26/Al 7075 composite rod, in which Mg MB26 serves as the sleeve and Al 7075 serves as the core, is fabricated via the process of co-extrusion. The influence of extrusion speed on the microstructure evolution, interface bonding and mechanical response of the Mg MB26/Al 7075 composite rod is investigated. The results show that the typical extrusion texture of Mg sleeve does not change during co-extrusion; however, the average grain size in the Mg sleeve slightly changes from 1.57 μm in the case of extrusion speed of 0.3 mm/s to 2.78 μm in the case of extrusion speed of 2.1 mm/s. The thickness of interface transition layer increases significantly from 5.5 to 50 μm, and therefore, the interface bonding becomes deteriorative with increasing extrusion speed; in particular, many cavities emerge in the case of 1.2 and 2.1 mm/s.

Key words: MB26/7075 composite rod, Extrusion speed, Microstructure evolution, Interface bonding, Mechanical response

Yu Chen, Rui Zhang, Tao Zhou, Li Hu, Jian Tu, Lai-Xin Shi, Yan Zhi, Li-Wei Lu, Qiang Chen, Ben-Hong Liao, Lei Liu, Wen-Jun Ge, Jing Xiao, Ming-Bo Yang. Influence of Extrusion Speed on the Microstructure Evolution, Interface Bonding and Mechanical Response of Mg MB26/Al 7075 Composite Rod[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(2): 253-262.

Figures/Tables 10

Table 1 Chemical composition of the base metal in the test (mass fraction, %)

Alloy	Si	Fe	Cu	Mn	Mg	Cr	Zn	Ti	Al	Zr	RE
7075	≤0.4	≤0.5	1.2-2.0	≤0.4	2.1-2.9	0.018-0.28	5.1-6.1	≤0.2	Bal.	-	-
MB26					Bal.		5.9			0.6	1.0

Fig. 1 Schematic diagrams of fabricating Mg/Al composite rods by co-extrusion

Fig. 2 Surface profile of extruded bars at different extrusion speeds

Fig. 3 Inverse pole figures and the corresponding pole figures of the selected regions at various speeds in the Mg sleeve in Mg/Al composite rod: a, b 0.3; c, d 0.7; e, f 1.2; g, h 2.1 mm/s (where a, c, e, g refers to region A, b, d, f, h is for region B)

Fig. 4 X-ray diffraction patterns near the interface of Mg substrate in composite rod at different extrusion speeds: a 0.3 mm/s, b 0.7 mm/s, c 1.2 mm/s, d 2.1 mm/s

Fig. 5 Cross-sectional schematic SEM micrographs of the Mg/Al composite rods at various speeds: a 0.3 mm/s, b 0.7 mm/s, c 1.2 mm/s, d 2.1 mm/s

Fig. 6 SEM images and EDS analysis of the reaction layer of the Mg/Al composite rods at different extrusion speeds: a 0.3 mm/s, b 0.7 mm/s, c 1.2 mm/s, d 2.1 mm/s

Fig. 7 Engineering stress-strain curves of the Mg sleeve and Mg/Al composite rod with different extrusion speeds compressed along ED: a Mg sleeve, b Mg/Al composite rod

Table 2 CYS, UCS and intensity of the Mg/Al composite rods with different VAL under compression along ED

Samples	Volume fractions of the Al (%)	0.2% CYS (MPa)	UCS (MPa)	Density (g/cm³)	Processing method	Ref.
MB26 (sleeve)/7075 (core)	6.6	263	470	1.88	Co-extrusion at 0.3 m/s	Present work
MB26 (sleeve)/7075 (core)	6.6	252	466	1.88	Co-extrusion at 0.7 m/s	Present work
MB26 (sleeve)/7075 (core)	6.6	246	453	1.88	Co-extrusion at 1.2 m/s	Present work
AZ31 (sleeve)/7050 (core)	8.4	194	430	1.87	Co-extrusion+two-stage aging at 120 °C for 8 h and 150 °C for 9 h	[21, 22]
	16	212-217	445-506	1.95
	24.2	227	473	2.03
	33.8	270	500	2.08
7050 (sleeve)/AZ31 (core)	43.7	235	351	2.24	Co-extrusion+aging at 120 °C for 8 h+annealed at 400 °C for 63 h+aged at 150 °C for 9 h	[20]
7050 (sleeve)/AZ31 (core)	55.6	264	375	2.36		[20]

Fig. 8 SEM micrographs of Mg/Al composite rod compressed by 6% at elevated extrusion speeds: a 0.3 mm/s, b 0.7 mm/s, c 1.2 mm/s

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