Effect of gadolinium addition on microstructural evolution and solidification characteristics of Al-15%Mg2Si in-situ composite

Role of Gd addition on machinability of Al-15%Mg2Si in-situ composite during dry turning

“…Similarly, it has been reported that the addition of Gd element to Al-15%Mg2Si composite results in the considerable refinement/modification of composite structure and corresponding enhancement of mechanical properties of the composite compared to other RE elements [12]. For this, it is predicted that the addition of Gd element to Al-15%Mg2Si composite could improve the machinability characteristics.…”

“…In addition, the composition of needle-like particle is AlSiGd (Fig.3d). The modification mechanism of Gd addition on primary Mg2Si in Al-15%Mg2Si composite can be attributed to the nonhomogeneous nucleation, mechanism of growth restriction of Mg2Si particles by Gd IMCs and poisoning influence by altering the growth manner of primary Mg2Si particles by absorbing the Gd atoms on {100} facets of primary Mg2Si, hindering the growth [12]. It is worth mentioning that the ultimate tensile strength (UTS) value for the composite without Gd was 204.79 MPa, which increased to 224.62 MPa with the addition of 1.0 wt.…”

“…The tensile properties and machinability of hypereutectic Al-Mg2Si in-situ composite are determined by the morphology and size of Mg2Si particles; therefore, controlling the structure of Mg2Si particles is deemed crucial to achieve the superb mechanical and machinability properties [6][7][8]. In this respect, several approaches such as rapid solidification [9], hot extrusion [10] and superheat treatment [11] and the addition of modifying elements such as Gd [12], Bi [13], Ba [14] and Sb [15] have been applied to control the microstructure of Al-Mg2Si composite.…”

“…In addition, Gd has no known biological role, and has low toxicity [16]. Gd addition is also utilized to modify the structure of primary Mg2Si in Al-Mg2Si composite as well as Mg-Si alloys [4,12].…”

The Effect of Gadolinium on the Microstructures and Charpy Impact Properties of Super Duplex Stainless Steels

“…The ability of Gd to reduce the grain size, change the residual pore size and shape after sintering enhances fatigue behavior. Ghandvar et al fabricated an Al-15%Mg 2 Si in situ composite by adding Gd [19]. Typically, Gd was an important component that caused the formation of small Al 3 Gd particles, which acted as the heterogeneous nucleation substrates for Mg 2 Si, thereby modifying the composite's macrostructure.…”