Electron Microscopy Study of Microstructure Modifications in RS P/M Mg₉₇Zn₁Y₂ Alloy

Comparison of microstructure in Mg–10Y–5Gd–0.5Zr and Mg–10Y–5Gd–2Zn–0.5Zr alloys by conventional casting

“…Due to the chemical order, all the B-layers in the ABCBCB stacking of the 6H-base structure are not equivalent, and hence the present long-period ordered structure should be denoted as ABCBCB' where B' represents the layer enriched by Zn and/or Y. The period segregation of Y and/or Zn elements is presumed to cause an increase in the stability of the novel long-period hcp structure [10][11][12][13][14][15][16]. In order to understand the formation mechanism of the LPSO structure, we have investigated the morphology at grain boundaries.…”

The microstructure evolution with lamellar 14H-type LPSO structure in an Mg96.5Gd2.5Zn1 alloy during solid solution heat treatment at 773K

“…At present, the mechanical properties and the formation of LPSO structures have been systematically investigated for Mg-RE-Zn (RE = Y, Gd, Tb, Dy, Ho, Er, Tm) alloys [6][7][8][9][10][11][12][13][14][15][16][17]. According to the published reports [8,[15][16][17][18][19], these alloys can be classified into two types in terms of if LPSO structures exist in these as-cast alloys.…”

“…Because of significant aging strengthening [1][2][3][4] and long period stacking ordered (LPSO) structures strengthening [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], magnesium alloys containing rare earth (RE) elements (especially heavy RE ones such as Y, Gd, etc.) have been focused on as promising materials with high strength and high-creep resistance.…”

Crystal structure of the mirror symmetry 10H-type long-period stacking order phase in Mg–Y–Zn alloy

“…In recent years, Mg-Y-Zn alloys have received considerable attention due to their excellent mechanical properties and unique microstructures [11][12][13][14][15][16][17][18][19][20]. In particular, various novel lamellar structure of long-period stacking order (LPSO) phases have been observed, including 6H, 10H, 14H, 18R and 24R [21][22][23][24][25][26][27][28][29][30][31].…”