A CsCl-type phase in electrodeposited AlMn alloys

摘要: Since the work of Goedecke and Koester it has been known that central part Al-Mn phase diagram is occupied at room temperature by [gamma][sub 2] phase, while high two other phases, [gamma] 1], have reported in same compositional range. A more recent study confirmed existence these phases. The low-temperature a rhombohedrally distorted [gamma]-brass lattice Al[sub 8]Cr[sub 5]-type. structures high-temperature phases not determined since they could be retained alloys quenched to due their transformation rates. Only recently, structure [gamma]-phase was studied in-situ Ellner using x-ray diffraction. According this study, bcc (W-type) with parameter 0.3063 nm. second [gamma]1 directly technical problems associated its higher formation temperature; however, suggested cubic type. previous electrodeposited compositions ranging up 50 atomic pct Mn revealed exhibiting an diffraction pattern which consistent CsCl-typemore » 0.299 containing ranged from 36 43 Mn. At lower concentrations, electrodeposits contained described earlier metastable [tau] (CuAu-type) observed. In paper authors confirm presence CsCl-type associate Ellner.« less