Study of precipitates in an aged Mg-3.6wt%Zn alloy by an X-ray method

Natural Aging in Mg-Zn(-Cu) Alloys

“…These precipitates were inhomogeneously distributed and present in a very low number density. These precipitates correlate well with the X-ray diffraction results by Takahashi et al; [13] therefore, they will be referred to as GP1 zones. In the same specimen, precipitation in some grains was also observed by conventional TEM.…”

“…Three types of Guinier-Preston (GP) zones were reported to form in these alloys, mainly at lower temperatures. The X-ray diffraction studies on Mg-3.6 wt pct Zn alloy by Takahashi et al [13] showed that at temperatures below 60°C, ''GP1'' zones formed directly from the solid solution as plates parallel to f11 " 20g Mg planes, while below 80°C, ''GP2'' zones formed in the form of oblate spheroids on {0001} Mg planes. The disclike ''GP'' zones were reported to form parallel to {0001} Mg planes.…”

Reduced temperature (22–100°C) ageing of an Mg–Zn alloy

“…In particular, it was reported that Mg-Zn alloys do not harden appreciably at ambient temperature (for ageing time up to about 1000 h) [1,6]. A very few studies were conducted on ageing at intermediate temperatures [6,17] and two types of GP zones, detected using an X-ray diffraction (XRD), were reported to form during ageing below 60 • C (GP1 zones as plates parallel to {1 12 0} Mg planes) and below 80 • C (GP2 zones as oblate spheroids on {0 0 0 1} Mg planes) [17]. An additional type of GP zones was reported to form on basal planes of magnesium as thin discs [7].…”

Materials Processing for Structural Stability in a ZK60 Magnesium Alloy

“…[10][11][12][13][14][15][16][17] For example, Mg-5 mass%Zn alloy exhibits age hardening by the precipitation of needle shaped MgZn phase after prolonged aging at $422 K. 10) To date, however, TMT to attain microstructural stability has not been investigated in magnesium alloys.…”