In Situ Aluminum Alloy Coating on Magnesium by Hot Pressing

doi:10.1007/s40195-015-0295-8

Abstract

Abstract:

In the present study, pure magnesium was in situ coated with pre-alloyed Al-Cu-Mg alloy through hot pressing. The produced samples were characterized by means of hardness, wear properties and microstructure characterization. A ball-on-disk test was used to determine the dry sliding wear characteristics of the compacts. The results showed that the hot pressing technique has been successfully applied for producing magnesium parts with compatible wear resistance and hardness to aluminum. The in situ coating of Al on Mg by hot pressing resulted in an increase in hardness of about 30% compared with the pure Mg substrate. The wear rate and friction coefficient of the samples decreased with Al coating and increased with an increase in the applied load during the wear tests, compared with the uncoated material.

Key words: Magnesium, Powder metallurgy, Coating Al-Cu-Mg alloy, Hot pressing

Ridvan Yamanoglu. In Situ Aluminum Alloy Coating on Magnesium by Hot Pressing[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(8): 1059-1064.

Figures/Tables 8

Fig. 1 Sintering cycle used for in situ coating process

Fig. 2 SEM images of the fracture surface of the hot pressed compacts: a, b general image of the compact; c close-up of the interface

Fig. 3 SEM image and EDS analysis result of coated sample

Fig. 4 Hardness profile of the composite of Mg substrate with Al-Cu-Mg alloy coating layer

Table 1 Wear rate and friction coefficient of Mg substrate and composite of Mg substrate with Al alloy layer as a function of applied load

Load (N)	Mg substrate		Composite of Mg with Al alloy layer
Load (N)	Wear rate (mm³/m)	Friction coefficient	Wear rate (mm³/m)	Friction coefficient
20	11.7 ± 0.6	0.26	9.1 ± 1.1	0.19
40	15.1 ± 0.9	0.29	13.6 ± 1.4	0.24

Fig. 5 Worn surfaces of the Mg substrate a, c and the composite of Mg with Al alloy layer b, d under 20 N a, c and 40 N b, d loads

Fig. 6 SEM images of the surface of counterpart balls for Mg substrate a and Mg substrate with Al alloy layer b

Fig. 7 Worn surface profiles scanned along the wear tracks with SEM images for Mg substrate a and M substrate with Al alloy layer b

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