The Microstructures and Tensile Properties of As-Extruded Mg–4Sm–xZn–0.5Zr (x = 0, 1, 2, 3, 4 wt %) Alloys

Abstract

Abstract:The microstructures and tensile properties of as-cast and as-extruded Mg-4Sm-xZn-0.5Zr (x = 0, 1, 2, 3, 4 wt %) alloys were systematically investigated by optical microscope, X-ray diffractometer (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). Numerous nanoscale dynamic precipitates could be observed in the as-extruded alloys containing high content of Zn, and the nanoscale particles were termed as (Mg,Zn) 3 Sm phase. Some basal disc-like precipitates were observed in as-extruded Mg-4Sm-4Zn-0.5Zr alloy, which were proposed to have a hexagonal structure with a = 0.556 nm. The dynamic precipitates effectively pinned the motions of DRXed (dynamic recrystallized) grain boundaries leading to an obvious reduction of DRXed grain size, and the tensile yield strength of as-extruded alloy was improved. The as-extruded Mg-4Sm-4Zn-0.5Zr alloy exhibits the best comprehensive mechanical properties at room temperature among all the alloys, and the yield strength, ultimate tensile strength and elongation are about 246 MPa, 273 MPa and 21% respectively.

Microstructure and Mechanical Properties of Structural Metals and Alloys

“…A total of 22 papers cover a ranger of structural metals and alloys. The major portion of these papers is focused on the mechanisms of microstructure evolution and the mechanical properties of metallic materials subjected to various thermo-mechanical, deformation, or heat treatments [1][2][3][4][5][6][7][8][9][10][11][12]. Another large portion of the studies is aimed on the elaboration of alloying design of advanced steels and alloys [13][14][15][16].…”

“…As a guest editor, I have the pleasure to note that present collection is not limited to such frequently used materials like steel and aluminum alloys. Interested readers will find attractive reports on magnesium [1], nickel [3], titanium [4,5], copper [6,11], and tin [14] alloys. Those who are interested in innovative materials, and their processing and applications, are suggested to take a good look at Ti/TiB metal-matrix composite [5] and high-entropy alloys [9].…”

Phase Equilibria of the Mg-Zn-Sm System in Mg-Rich Corner at 320 °C and 400 °C

“…Samarium (Sm), which has greater solid solubility in Mg and is much cheaper than neodymium (Nd), displayed higher strength for modifying Mg-Zn alloy [13]. Several studies on the mechanical properties of Mg-Zn-Sm alloys with different weight ratios of Zn to Sm have been published [14][15][16]. However, limited information on the ternary compounds has been reported.…”

Microstructures, Tensile Properties and Creep Characteristics of as-Extruded AZ91 Magnesium Alloy Containing Si, Ca and Rare Earth Elements

“…Magnesium alloys are new light-weight metal structural materials [1][2][3][4]. Mg-Al-Zn (AZ series) alloys are among the most popular magnesium alloys and widely used for commercial applications, owing to their low cost, excellent room temperature strength, good die castability and favorable corrosion resistance [5].…”