Significantly Enhancing the Ignition/Compression/Damping Response of Monolithic Magnesium by Addition of Sm2O3 Nanoparticles

Abstract

Abstract:The present study reports the development of Mg-Sm 2 O 3 nanocomposites as light-weight materials for weight critical applications targeted to reduce CO 2 emissions, particularly in the transportation sector. Mg-0.5, 1.0, and 1.5 vol % Sm 2 O 3 nanocomposites are synthesized using a powder metallurgy method incorporating hybrid microwave sintering and hot extrusion. The microstructural studies showed dispersed Sm 2 O 3 nanoparticles (NPs), refinement of grain size due to the presence of Sm 2 O 3 NPs, and presence of limited porosity. Microhardness and dimensional stability of pure Mg increased with the progressive addition of Sm 2 O 3 NPs. The addition of 1.5 vol % of Sm 2 O 3 NPs to the Mg matrix enhanced the ignition temperature by~69 • C. The ability of pure Mg to absorb vibration also progressively enhanced with the addition of Sm 2 O 3 NPs. The room temperature compressive strengths (CYS and UCS) of Mg-Sm 2 O 3 nanocomposites were found to be higher without having any adverse effect on ductility, leading to a significant increase in energy absorbed prior to compressive failure. Further, microstructural characteristics are correlated with the enhancement of various properties exhibited by nanocomposites.

The Potential of Magnesium Based Materials in Mandibular Reconstruction

“…Mg-based implants share a similar specific density to that of human bone (Table 1), unlike commonly used permanent biomaterials such as stainless steels and titanium alloys [62,63]. Further, in comparison to commercially used orthopedic implants like titanium alloys, stainless steel, and cobalt-chromium (Co-Cr) alloys, Mg possesses considerably lower elastic modulus matching the elastic modulus of the bone (trabecular/cancellous bones) which aids in eliminating/decreasing any possible stress shielding effects at the bone/implant interface and facilitate new bone formation [64][65][66][67]. In addition, Mg 2+ is the fourth most abundant cation involved in many chemical reactions in our body, hence establishing its prime importance in the metabolism process [68].…”

Utilizing Low‐Cost Eggshell Particles to Enhance the Mechanical Response of Mg–2.5Zn Magnesium Alloy Matrix

“…The results indicate that near‐dense materials can be fabricated using the processing parameters used in the present study. However, increased porosities (>1%) at higher weight percentages of ES (5 and 7%) may be due to the higher degree of agglomeration of ES particles in Mg matrix . The results also indicate that the addition of eggshell does not affect the density significantly which is desirable for reduced energy consumption and material cost.…”

“…The experimental CTE values are found to be lesser than their corresponding theoretical CTE values with <1% deviation from the theoretical value observed. This response may be attributed to the overriding effect of the presence and progressive addition of the eggshell particles over the experimental porosity values obtained for the composites . The results of CTE measurements suggest that a positive contribution to the thermal and dimensional stability of Mg2.5Zn alloy is made due to the presence of ES particles.…”

“…On the other hand, magnesium alloys are biocompatible and have an advantage over other biomaterials as a replacement of permanent vascular implants . Mg also possesses modulus properties close to that of natural bone and also have an advantage over existing metallic biomaterials like Ti6Al4V alloy, 316L SS, and Co–Cr alloys . Not only does Mg helps in mitigating the stress–shielding effects, but also, due to its bioresorbable nature, there is no need for revision surgery.…”

Enhancing Mechanical Response of Monolithic Magnesium Using Nano-NiTi (Nitinol) Particles

“…Further, material wastage associated with the DMD method is also 20 to 30% less than those associated with conventional casting [17]. Recent studies on DMD fabricated Mg nanocomposites with different reinforcements (SiC, B 4 C, SiO 2 , TiO 2, Al 2 O 3 and so on) have reported superior enhancement in the mechanical and ignition properties of magnesium in the presence of nanoparticles [1,9,[18][19][20][21][22][23]. However, no attempt has been yet made to investigate NiTi as a reinforcement for fabricating Mg metal matrix nanocomposites.…”