Effect of Mn addition on microstructure, texture and mechanical properties of Mg–Zn–Ca alloy

Extruded Mg–Zn–Ca–Mn alloys with low yield anisotropy

“…Table 1 compares the reported values of the as-extruded commercial Mg alloys such as AZ and ZK60A [1], experimental Mg-6.1Zn-0.4Ag-0.2Ca [5,6], Mg-6.1Zn-0.4Ag-0.2Ca-0.6Zr (wt%) alloys [5,6], Mg-1.0Zn-0.2Ca [30], Mg-5.3Zn-0.6Ca-0.3Mn [33] and Mg-4.7-0.5Ca [34] (all in wt%) with those of the as-extruded ZXM620. The e TF of the as-extruded ZXM620 are higher than those of the as-extruded commercial ZK60A and AZ80A, and are comparable to those of the as-extruded AZ31B and AZ61A.…”

“…Because the extrusion parameters (such as the extrusion temperatures) exert a great influence on the DRX ratio, the DRXed grain size, the precipitates and the texture of the extruded Mg alloy, as introduced above; thus it is desirable to develop the low-cost rare-earth-free ZXM620 alloys with lower yield anisotropy and much higher strengths by combining the contributions of lower-temperatures extrusion and subsequent heat treatment, the detailed analysis of which is in progress. [1] 199 96 15 -Mg-6Al-1Zn-1Mn (AZ61A) [1] 226 130 16 -Mg-8Al-Zn (AZ80A) [1] 247 211 11 -Mg-6Zn-Zr (ZK60A) [1] 261 226 12 -Mg-6.1Zn-0.4Ag-0.2Ca [5,6] 153 103 25 -Mg-6.1Zn-0.4Ag-0.2Ca-0.6Zr [5,6] 289 246 17 -Mg-1.0Zn-0.2Ca [30] 135 -37 350 Mg-5.3Zn-0.6Ca [33] 220 -21 300 Mg-5.3Zn-0.6Ca-0.3Mn [33] 272 -19 300 Mg-4.7-0.5Ca [34] 291 -16 250…”

Development of high-strength, low-cost wrought Mg–2.5mass% Zn alloy through micro-alloying with Ca and La

“…In Mg alloys, Mg-Al and Mg-Zn alloys are promising candidates for the base alloys to be microalloyed as low-cost, high-strength Mg alloys due to high solubility of Al and Zn in Mg at elevated temperatures and ability of forming coherent and semi-coherent metastable intermetallics at room temperature [7]. In the Mg-Zn system, many trace elements including Ca, Sr, Ag, Zr, Mn, Y and Ce, have been added singly, doubly and even multiply, such as Mg-4Zn-0.1Ca (all compositions are expressed in mass% in this paper unless otherwise specified) [8], Mg-4.9Zn-0.2Ce [9], Mg-1Zn-0.12Sr [10], Mg-5Zn-0.9Y-0.16Zr [11], Mg-2Zn-0.3Zr-0.9Y [12], Mg-6.18Zn-0.16Ca-0.42Ag [13], Mg-4Zn-0.3Ca-0.1Ce [14], Mg-5.25Zn-0.6Ca-0.3Mn [15], Mg-6Zn-0.2Ca-0.8Zr [16], Mg-6.15Zn-0.42Ag-0.16Ca-0.57Zr [17], Mg-3Zn-0.25Ca-0.5Zr-0.15Mn [18], Mg-3Zn-0.5Ag-0.25Ca-0.15Mn [19] and Mg-3Zn-0.5Ag-0.25Ca-0.15Mn-0.5Zr [19,20]. Trace addition of Ca singly to Mg-Zn alloys causes significant grain refinement during solidification, extrusion and rolling [21], and weakens basal texture of the wrought Mg-Zn alloys [22].…”

“…Single addition of Zr and Mn leads to grain refinement and dense precipitates [23,24]. Compared with single addition of trace elements, multiple additions are more effective to modify the microstructure and improve mechanical properties of Mg-Zn alloys [15][16][17]25,26]. For instance, the extruded Mg-6Zn-0.2Ca-0.8Zr alloy shows a finer microstructure and denser precipitate distribution than the extruded Mg-6Zn-0.2Ca ternary alloy [16].…”

“…Zn content in Mg-Zn base alloys reported in literature [8][9][10][11][12][13][14][15][16] usually ranges from 1-8% in mass. Lower content of Zn leads to high ductility but lower strength due to coarser grains and less precipitates [10,30], for instance, Mg-1Zn-0.5Ca [31] possesses YS 120 MPa and UTS 200 MPa after extrusion, which is far less than the strength requirement of structural parts.…”