Spheroidizing Behavior and Spheroidizing Kinetics of W-phase During Solid-Solution Treatment in Mg-Zn-Y-Mn-(B) Alloys

doi:10.1007/s40195-016-0520-0

Abstract

Abstract:

The spheroidizing mechanism of W-phase in the Mg-Zn-Y-Mn-(B) alloys during solid-solution treatment was investigated by using kinetic methodologies. The microstructure and mechanical properties of heat-treated Mg₉₄Zn_2.5Y_2.5Mn₁ alloy containing 0.003 wt% B were compared with heat-treated Mg₉₄Zn_2.5Y_2.5Mn₁ alloy. The heat-treated Mg₉₄Zn_2.5Y_2.5Mn₁ alloy with 0.003 wt% B contained fine and uniform W-phase particles, which exhibited optimal mechanical performance. The ultimate tensile strength, yield strength and elongation were 287.7, 125.5 MPa and 21.1%, respectively.

Key words: Magnesium alloys, W-phase, Spheroidizing, Kinetics, Microstructure, Mechanical properties

Kai Yang, Jin-Shan Zhang, Xi-Mei Zong, Wei Liu, Chun-Xiang Xu. Spheroidizing Behavior and Spheroidizing Kinetics of W-phase During Solid-Solution Treatment in Mg-Zn-Y-Mn-(B) Alloys[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(5): 464-469.

Figures/Tables 6

Fig. 1 OM images of a as-cast Mg-Zn-Y-Mn alloy; b as-cast Mg-Zn-Y-Mn-B alloy; c heat-treated Mg-Zn-Y-Mn alloy; d heat-treated Mg-Zn-Y-Mn-B alloy

Fig. 2 XRD patterns of Mg-Zn-Y-Mn-(B) alloys in different stages

Fig. 3 SEM images of the as-cast Mg-Zn-Y-Mn-B alloy after solid-solution treatment at 773 K for different hours a 0 h; b 1 h; c 5 h; d 20 h; e 40 h; f 55 h, EDS spectra of g second phase h eutectic structures in heat-treated Mg-Zn-Y-Mn-B alloy

Fig. 4 Schematic presentation of the W-phase evolution during solid-solution treatment a coarsening of flake W-phase, b spheroidizing of W-phase, c growth of globular W-phase

Fig. 5 Tensile stress-strain curves of Mg-Zn-Y-Mn-(B) alloys in different stages

Fig. 6 Concentrations of Zn and Y in Mg matrix phase at different solid-solution time in Mg-Zn-Y-Mn-B alloy, as measured by the SEM-EDS method

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