Grain Growth Behaviors in a Friction-Stir-Welded ZK60 Magnesium Alloy

Abstract

Grain growth during annealing of a friction-stir-welded (FSWed) ZK60 magnesium alloy has been investigated. We have found that (1) thermal stability exhibited in different parts of stirred zone (SZ) was very different, (2) grain growth was fairly abnormal, and (3) grain growth was directional and shapes of developed grains resembled flow patterns inherent to FSWed structure. We have shown that all peculiarities of the grain growth behaviors can be explained in terms of heterogeneous distribution of second phase particles resulted from FSW.

Grain structure evolution during friction-stir welding of AZ31 magnesium alloy

“…Nevertheless, transmission electron microscopy (TEM) observations typically reveal high dislocation density in grain interiors [2,[8][9]. Limited experimental data evidence that the microstructure may contain a significant fraction of low-angle boundaries (30-35%) [10,11] and misorientation-angle distribution is characterized by an increased proportion of 30°boundaries [11]. The material in the central part of the SZ exhibits a very specific, h0 0 0 1i||welding direction, texture (e.g.…”

Effects of heat input on tensile properties and fracture behavior of friction stir welded Mg–3Al–1Zn alloy

“…Problems with the conventional fusion welding, limiting the use of the magnesium alloys, could be eliminated by friction stir welding (FSW), which is a solid state welding process [1]. Nowadays, FSW has been widely used to join the magnesium alloys, such as Mg-Al-Zn [2][3][4][5][6][7], Mg-Zn-Y [8,9], and Mg-Al-Ca [10].…”

Development of Fine-Grained Structure Caused by Friction Stir Welding Process of a ZK60A Magnesium Alloy

“…3,4) Nevertheless, transmission electron microscopy (TEM) observations have typically revealed high dislocation density in grain interiors. [5][6][7] Limited experimental data have shown that the microstructure may contain significant fraction of low-angle boundaries (30 to 35%) 8,9) and misorientationangle distribution is featured by an increased proportion of 30-deg. boundaries.…”