Creep Behavior and Deformation Substructures of Thixomolded Mg‐Al‐Ca Alloys

Effects of Eutectic Compounds Formed along Grain Boundaries in Thixomolded<SUP>&reg;</SUP> Alloy Mg<SUB>96</SUB>Zn<SUB>2</SUB>Y<SUB>2</SUB> on Creep Deformation

“…It is reported that eutectic compounds are formed along grain boundaries in some types of Mg alloys (e.g., Mg-Al, 6,7) Mg-Al-Ca, 6,7) Mg-Al-Sr 8) and Mg-Al-Zn 9,10) ) fabricated by Thixomolding Ò process. According to Huang et al, solidification of the alloy ZW66 (Mg-5.52 mass%Zn-6.48 mass%Y), whose chemical composition is similar to that of Mg 96 Zn 2 Y 2 (Mg-5 mass%Zn-6.7 mass%Y), occurs in three stages: (1) first, the -Mg matrix is formed, (2) then, Mg 12 YZn is formed by the pseudobinary eutectic reaction, and (3) finally, Mg 3 Y 2 Zn 3 is formed by the same reaction.…”

“…11) In the case of Mg alloys in which eutectic compounds are formed along grain boundaries, suppression of grain boundary sliding by these compounds is considered one of the important creep strengthening mechanisms. 7,[12][13][14] It is expected that creep strengthening will also occur in the thixomolded Ò alloy Mg 96 Zn 2 Y 2 , because it consists of an -Mg matrix and eutectic compounds formed along grain boundaries. However, the strengthening effects of the eutectic compounds in Mg 96 Zn 2 Y 2 during high-temperature creep deformation have not been described in detail.…”

Newly Developed Heat Resistant Magnesium Alloy by Thixomolding^®

“…The biggest problem associated with magnesium alloys, especially in automotive application, is their poor heat resistance compared to aluminum die cast alloy at elevated temperatures. For this purpose, many die cast Mg-Al based alloys have been studied in recent years [7][8][9][10][11][12][13][14][15].We investigated the effects of the chemical composition on the creep resistance at elevated temperatures, the corrosion resistance at room temperature and the fluidity during thixomolding® about the Mg-Al-Ca-Mm-Sr alloy in our previous works [16][17][18][19]. In the end, we optimized the chemical composition of this series alloy as AXEJ6310.…”

Effect of Calcium Additions on Creep Properties of a Die-Cast AM50 Magnesium Alloy

“…[19][20][21][22] Among the alloying elements described above, calcium is both a cost effective and lighter alternative to rare-earth elements for improving high-temperature creep strength of Mg-Al alloys. [23][24][25][26][27] Phase equilibria 28,29) and liquid projections 30) in the Mg-Al-Ca ternary system have been clarified by experimental methods and via thermodynamic modeling with particular emphasis on the Mg-rich corner. The aim of the present study is to elucidate the effect of calcium additions on creep properties for the AM50 die-cast alloy in the temperatures above 423 K.…”