Microstructure and strengthening mechanisms of Mg-6Al-6Nd alloy

Abstract

The microstructure and strengthening mechanisms of as-cast Mg-6Al-6Nd alloy were studied. The results show that the addition of 6 wt.% Nd into Mg-6Al alloy leads to the precipitation of Al 11 Nd 3 and Al 2 Nd phases and decrease in the content of Al solid soluted in Mg-Al matrix. The volume fractions of Al 11 Nd 3 and Al 2 Nd phases are 3.64% and 0.34%, respectively. Compared with Mg-6Al alloy, the ultimate strength, yielding strength, and elongation of Mg-6Al-6Nd alloy at room temperature and 175°C are enhanced in some degrees. The strengthening mechanisms of Mg-6Al-6Nd alloy are mainly composed of solid solution strengthening of Al solid soluted in Mg-Al matrix and grain refinement strengthening, dispersion strengthening, and composite strengthening brought by the precipitation of Al 11 Nd 3 phase. The composite strengthening includes the load transfer from the matrix to Al 11 Nd 3 phase and the enhancement of dislocation density due to the geometrical mismatch and thermal mismatch between the matrix and Al 11 Nd 3 phase.

Research Progress of Mg-Al Based Alloys

“…The ultimate strength (UTS), yielding strength (YS), and elongation (ε) of Mg-6Al alloy are 185MPa, 70MPa, and 10% at room temperature and 127MPa, 56MPa, and 19% at 175°C, respectively. Compared to Mg-6Al alloy, The UTS, YS, and ε of Mg-6Al-6Nd alloy are enhanced about 12%, 60%, and 50% at room temperature and 17%, 34%, and 26% at 175°C, respectively [6] .…”

Microstructure, tensile properties and creep behaviors of as-cast Mg–2Al–1Zn–xGd (x=1, 2, 3, and 4wt.%) alloys

“…According to the previous investigations [17,18], the volume fraction of the (Mg, Al) 3 Gd phase in the alloys can be described as the below relationship:…”

Microstructures and mechanical performance of Mg–4Si–6Ni–xY in situ composite after extrusion process

“…As the lightest structural metal, magnesium has various applications, including aerospace, automotive, electronics, and medical implants [1]. Although pure Mg has its drawbacks such as its poor mechanical performance, the extensive use of this metal can be related to its unique properties such as good machining properties, cost-effective casting, significant specific strength, and very low density (64% and 22% relative to metals such as Al and Fe, respectively) [2-4]. Mechanical properties of Mg can be improved by performing a series of measures such as the addition of suitable alloying elements [5,6], hot working[7,8], and particle strengthening (composite strengthening) [9].…”