Research on the formation process of selective laser melting Mg–Y–Sm–Zn–Zr alloy

Abstract

Selective laser melting technology was proposed to form the multi-element mixed rare earth magnesium alloys of Mg–3.4Y–3.6Sm–2.6Zn–0.8Zr (wt-%). The formation process, relative density, evaporation, microstructure and microhardness of the deposited samples at different laser power and scanning speed were characterised. Under the experimental conditions with a laser power of 40 W and a scanning speed of 300 mm s−1, the maximum relative density of the sample is 98.6%. The evaporation of elements exists but is not serious under all process parameters. Compared with the as-cast process, the microstructure of the samples prepared by SLM is mainly composed of α-Mg matrix and (Mg, Zn)3(Y, Sm) eutectic phase, Mg12(Y, Sm)Zn eutectic phase and LPSO structure are not found.

Laser Powder Bed Fusion Applied to a New Biodegradable Mg-Zn-Zr-Ca Alloy

“…Until now, research works have focused only upon a limited number of L-PBF-processed Mg-based biomaterials. Those relevant are: pure Mg [ 12 ]; binary Mg alloys such as Mg-Al [ 9 , 13 ], Mg-Ca [ 14 ] and Mg-Zn [ 15 ]; ternary alloy systems such as AZ (Mg-Al-Zn) [ 16 ] and ZK (Mg-Zn-Zr) [ 17 ] series; Mg alloys with rare earth (RE) elements such as WE43 (Mg-Zr-RE-Y) [ 2 ] and Mg-Zn-Dy [ 18 ]; Mg-Zn-Zr-Nd alloys [ 5 ]; Mg–Y–Sm–Zn–Zr [ 19 ]; and Mg-11.00Gd-1.77Zn-0.43Zr [ 20 ]. Several pure Mg parts produced by the L-PBF technique have an elastic modulus in the range of 27–33 GPa, more closely matched with that of human bone compared with other metallic biomaterials [ 12 ].…”

“…The L-PBF-processed Mg-11.00Gd-1.77Zn-0.43Zr alloy has a yield strength (YS) of 325 MPa, an ultimate tensile strength (UTS) of 332 MPa and an elongation of 4.0% at room temperature. Comparing with as-cast alloys, L-PBF-ed samples have almost similar elongation (+0.4%) though higher YS (+162 MPa) and UTS (+122 MPa) [ 19 ].…”

Corrosion behaviour and properties of Mg–3.4Y–3.6Sm–2.6Zn–0.8Zr Alloy in 3.5 wt-% NaCl solution

“…In our previous work, a new type of yttrium–samarium–magnesium alloy with good heat resistance has been designed and developed. The heat treatment process, fine grain strengthening [15,16] and new forming technology of the alloy [17,18] have been studied. However, its corrosion behaviour and performance are still unclear, it is essential to study the corrosion mechanism of alloy.…”

Microstructure and mechanical properties of ZK60 alloy prepared using spark plasma sintering

“…Magnesium (Mg) alloys have the potential as lightweight structural materials for several applications, including aerospace and transportation, because of their high-specific strength [1-4]. The addition of the alloy elements leads to enhanced non-basal slip activity and reduced critical resolved shear stress difference between different slip systems, thereby improving the plastic deformation and the processing capacity of magnesium [5,6].…”