Mechanical and corrosion properties of newly developed biodegradable Zn-based alloys for bone fixation

Degradation behavior and mechanical strength of Mg-Zn-Ca bulk metallic glass composites with Ti particles as biodegradable materials

Studying the primary {\alpha}- and secondary {\beta}-relaxation process has contributed significantly to the understanding of the structure and rheology of metallic glasses. In this letter, we report on a third relaxation mechanism indicated by a maximum in the loss modulus at low temperatures, which we term {\gamma}-relaxation. Contrary to the {\alpha}- and {\beta}-relaxation mechanisms, this irreversible, low energy excitation causes a macroscopic rejuvenation, which we assign to non-affine atomic rearrangements in the matrix that are driven by thermal stresses during cooling. Observed in three different glassy alloys, the low temperature relaxation is identified as a general process in metallic glasses.

Gamma relaxation in bulk metallic glasses

Degradation of biodegradable implants: The influence of microstructure and composition of Mg-Zn-Ca alloys

Effects of Y on the Microstructure, Mechanical and Bio-corrosion Properties of Mg–Zn–Ca Bulk Metallic Glass

Samples with different diameters for Mg–Zn–Ca alloys were fabricated by copper mold casting method. The microstructure, amorphous nature and mechanical properties of as-cast samples were investigated by SEM, XRD and compressive tests. The results show that amorphous alloys or amorphous matrix composites can be formed in the composition of 1–6 at.% Ca for the samples with 2, 3 or 4 mm in diameters. During which the highest strength up to 828 MPa and plastic deformation of 1.28% were obtained for Mg 68 Zn 28 Ca 4 alloy with a monolithic amorphous structure. The best composition range defined both by strength and plastic deformation should be 3–5 at.% Ca for Mg 72− x Zn 28 Ca x ( x  = 0–6) alloys. At least over 400 MPa of fracture strength was obtained for the samples with an amorphous matrix, indicating that Mg–Zn–Ca alloys can be good candidates for amorphous matrix composites fabrication. In order to further consider the amorphous matrix effect on mechanical properties, Mg 95− x Zn x Ca 5 ( x  = 15–33) alloys were investigated by the same methods. Mg 80 Zn 15 Ca 5 alloy with no obviously amorphous structure exhibits a lower yielding strength of 307 MPa but it shows excellent plastic strain over 3.5%. We suggest that the amorphous matrix can enhance both the yielding strength and fracture strength of magnesium alloys.

Microstructure and mechanical properties of bulk Mg-Zn-Ca amorphous alloys and amorphous matrix composites

The invention discloses a high-hardness heat-resistant magnesium alloy. The alloy is characterized by comprising the following components in percent by mass: 5% of Al, 2% of Sn, 1-5% of Ca, not greater than 0.005% of impurity Fe, not greater than 0.015% of impurity Cu, not greater than 0.002% of impurity Ni, and the balance of Mg. According to the alloy disclosed by the invention, the high-temperature strengthening phases of Mg2Sn, Mg2Ca, Al2Ca and CaMgSn are generated by adding Al element, Sn element and Ca element together, so that the alloy has the characteristics of being high in hardness, good in heat resistance, and the like. Compared with the existing heat-resistant magnesium alloy, the alloy disclosed by the invention is good in room-temperature performance and high-temperature performance, low in production cost, high in efficiency, and capable of being widely applied to commercial components comprising automobile parts, electronic product components and aerospace components.

High-hardness heat-resistant magnesium alloy

The thin ribbons and the bulk cylindrical rods with diameters of 2 mm and 10 mm of the Vit1 metallic glass (MG) were prepared by the single roller melt spinning method and the copper mold injection casting method, respectively. The cooling rates of the samples during melt solidification were evaluated. The glass transition behaviors of three groups of MG samples with different solidification cooling rates were studied by differential scanning calorimetry (DSC) at different heating rates. The effects of melt cooling rate on the glass transition kinetic parameters such as apparent activation energy (E) and fragility parameter (m) of the Vit1 MG were studied using the Kissinger and the Vogel-Fulcher-Tammann (VFT) equations. Additionally, the structural relaxation enthalpy (ΔHrel) of three groups of MG samples was quantitatively analyzed by DSC through multi-step temperature rise and fall measurements. Results show that the melt cooling rate (R) has a significant effect on the glass transition kinetics and the structural relaxation of the Vit1 MG. As R decreases in the order of magnitude, the glass transition temperature (Tg), E, m, and ΔHrel of the Vit1 MG gradually decreases. Furthermore, in the range of the experimental cooling rates, E, m, and ΔHrel all have an approximately linear relationship with lgR.

/pdf/effect-of-melt-cooling-rate-on-glass-transition-kinetics-and-1frazistz2.pdf

Effect of melt cooling rate on glass transition kinetics and structural relaxation of Vit1 metallic glass

Damping capacity and mechanical properties of Fe3Cr2NiCuAl medium entropy alloys by tuning phase constituents

Ce69Al10Cu20Co1 bulk metallic glass (BMG) samples were annealed at different temperatures ranging from sub-Tg to super-Tg. Some of the samples were cooled to room temperature in air to obtain the relaxed ones, while the others were directly quenched in liquid nitrogen. Then the quenched samples were either withdrawn directly from the liquid nitrogen or subjected to cryogenic treatments (CTs) for different time intervals. The glass transition behaviors and heat flow of the samples in different states, including the as-cast, relaxed, quenched and Quenching+CT states, were investigated by using the differential scanning calorimeter (DSC). The work aims to study the tendency of the rejuvenation and relaxation behaviors of MG around the glass transition that were caused by the annealing, quenching and subsequent cryogenic treatments. The results show that the annealing temperature, cooling rate and cryogenic time play key roles in the rejuvenation and relaxation of MG around the glass transition.

The rejuvenation and relaxation around the glass transition of a Ce-based metallic glass controlled by annealing, quenching and cryogenic treatments

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