Application of rapid solidification powder metallurgy to the fabrication of high-strength, high-ductility Mg–Al–Zn–Ca–La alloy through hot extrusion

Microstructure Evolution of the Mg-5.8 Zn-0.5 Zr-1.0 Yb Alloy During Homogenization

“…In order to focus on the identification of potential Yb-containing precipitates during homogenization treatment and then revealing the strengthening effects induced by the novel Mg-Zn-Yb ternary system, the annealing temperatures were set to higher than the eutectic temperature of Mg-Zn binary alloy (340 ºC) 25 , which can reduce the influence of Mg-Zn binary precipitates. The alloys were heated at 360, 380, 400, 420, and 440 ºC, and held for different times of 4,8,12,16,20 and 24 h, then quenched in water to preserve the high-temperature microstructures.…”

“…However, the low-strength and poor ductility of traditional wrought Mg alloys at room temperature have limited their application 2,3 . Many endeavors have been devoted to developing highperformance wrought magnesium alloys by alloying small additions of rare-earth elements, such as Er, La, Y, Nd, Gd, and misch metal [4][5][6][7][8] , to commercial wrought magnesium alloys. In recent years, the heavy rare-earth element ytterbium (Yb) has attracted significant interest as an effective alloying additive.…”

High Strength Mg-5Sn Alloy Prepared by Rapidly Solidified Powder Metallurgy

“…As a unique material preparation technology, the RS powder metallurgy (P/M) technology can obtain matrix of super fine grain and dispersing nano-sized precipitated phases and improve sharply the mechanical properties. The emergence of RS P/M technology opens a new road for the research and development of super-high strength magnesium alloys [8][9]. The RS P/M method have been investigated for magnesium alloys, resulting in remarkable improvement in strength [10][11][12][13][14].…”

“…While the strength of magnesium alloys prepared by traditional methods are not high enough, or they contain a lot of expensive rare earth elements, more and more attentions are paid to new materials preparation technologies [5]. The rapidly solidification (RS) processing yields structural modification such as reduction of segregation, grain refinement, increasing solid solubility and the formation of non-equilibrium phases, which got outstanding performance [6][7][8]. As a unique material preparation technology, the RS powder metallurgy (P/M) technology can obtain matrix of super fine grain and dispersing nano-sized precipitated phases and improve sharply the mechanical properties.…”

Effect of ball milling time on nanocrystalline powders and bulk ultrafine-grained Mg-3Al-Zn alloy

“…According to Hall-Petch relationship, grain refinement is one of the most effective methods to improve the strength of the material, the resulting ultrafine-grained (UFG) structure can bring about high strength and even superplasticity at high strain rates and low temperatures [3][4][5]. Of the many techniques used for achieving UFG microstructures, such as equal channel angular extrusion (ECAE) [6], friction stir processing(FSP) [7], accumulative roll bonding (ARB) [8], high-pressure torsion (HPT) [9] and powder metallurgy (PM) [10], PM was an effective technique to synthesize high strength UFG Mg alloys [11][12][13][14][15]. A UFG structure is more easily achieved in precipitate-hardened Mg alloys or Mg-based composites due to the effective pining effect from the precipitates or added ceramic particles on the grain boundaries [16][17][18][19].…”