Mechanical and Damping Behavior of Age-Hardened and Non-age-hardened Al Alloys After Friction Stir Processing

doi:10.1007/s40195-019-00905-3

Abstract

Abstract:

This study investigated the microstructure, mechanical, and damping properties of a non-age-hardened Al alloy (5086) and an age-hardened Al alloy (7075) after friction stir processing (FSP). Microstructural analyses indicate that FSP led the grain refinement of samples, and the grains size decreased with the decrease in the tool rotation rate. Furthermore, FSP with low rotation rate promotes the η phase precipitation in the 7075 alloy, causing the micron-sized particles in the 5086 alloy to break up. After being subjected to FSP with low rotation rate, the 5086 and 7075 alloys exhibited excellent mechanical and damping properties. Such improved properties were ascribed to their equilibrium grain boundaries, fine grain, low density of dislocations, high fraction of high misorientation angle, and uniform particle distribution.

Key words: Aluminum alloy, Mechanical properties, Damping

Hiang-Jie Jiang, Bing Zhang, Chong-Yu Liu, Zhen-Xing Yang, Zong-Yi Ma. Mechanical and Damping Behavior of Age-Hardened and Non-age-hardened Al Alloys After Friction Stir Processing[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(9): 1135-1141.

Figures/Tables 7

Table 1 Chemical compositions of the 5086 and 7075 alloys

Alloys	Zn	Mg	Cu	Fe	Mn	Si	Cr
5086	0.03	4.1	0.02	0.16	0.45	0.07	0.1
7075	5.5	2.4	1.5	0.13	0.03	0.06	0.2

Fig. 1 TEM micrographs of a 5086 BM, b 400-100-FSP 5086, c 1200-100-FSP 5086, d 7075 BM, e 400-50-FSP 7075, f 800-50-FSP 7075 samples

Fig. 2 Orientation maps of a 5086 BM, b 400-100-FSP 5086, c 1200-100-FSP 5086, d 7075 BM, e 400-50-FSP 7075, f 800-50-FSP 7075 samples

Fig. 3 Grain size distributions for a 400-100-FSP 5086, b 1200-100-FSP 5086, c 400-50-FSP 7075, d 800-50-FSP 7075 samples

Fig. 4 Misorientation angle distributions of a 5086, b 7075 alloys

Fig. 5 Stress-strain curves of a 5086, b 7075 alloys

Fig. 6 Damping capacities of a 5086, b 7075 alloys

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