Effect of Ca addition on the microstructure and mechanical properties of heat-treated Mg-6.0Zn-1.2Y-0.7Zr alloy

Hou

et al. 2022

Preprint

The effect of Ca elements on the microstructure, mechanical properties and corrosion behavior of extruded AZ61-1Nd-xCa (x=0, 0.5, 1, 2 wt.%) alloys were investigated. The Al-Nd phase and Al2Ca particles are dynamically precipitated in the extruded alloys. The volume fraction of Al2Ca precipitates increases with the increase of Ca content. Moreover, the addition of Ca can refine the grain size. The tensile strength of the studied alloys remains almost constant and their hardness increases with increasing the Ca content. Regretfully, the presence of Al-Nd phase and brittle Al2Ca phase in the Ca-alloyed AZ61-Nd decreases significantly the elongation. The corrosion resistance of AZ61-1Nd alloy is conspicuously improved by the addition of 1 wt.% Ca, which is due to the uniformly and dispersedly distributed Al2Ca phase acting as a physical barrier. In this work, AZ61-1Nd-1Ca alloy with moderate strength and low corrosion rate was obtained, which is considered as a candidate material for application in marine environment.

Section: Discussion 41 Microstructurementioning

confidence: 99%

Effect of Ca addition on the microstructure, mechanical properties and corrosion behavior of AZ61-Nd alloy

Hou

et al. 2022

Preprint

“…In Al-free Ca added Mg alloys, due to its grain refining effect of Zr attributes to constitute fine and densely dispersed MgZn2 grains [15][16][17]. On the other hand, by addition of Ca into the Mg alloy with its refining effect [16] together with high heat resistance [17] and reduced flammability [18] and suitably applied thermomechanical processes the strength can be increased [19][20][21][22][23][24][25][26][27][28][29]. So the Ca addition to the Mg alloy results in the dynamic recrystallization and the occurrence of related grain growth to be inhibited.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of Various Ca Content on Microstructure and Mechanical Properties of As-cast ZK60 Magnesium Alloys

AKBAŞ¹,

Zeren²

2023

Politeknik Dergisi

The effect of various Ca content on microstructure and mechanical properties of as-cast Mg-6Zn-0.5Zr (wt.%) Mg alloys with hot tensile testing at 345°C were investigated. The alloy was produced with the LPDC method [1]. Microstructural characterization as-cast alloy demonstrated that wt.% Ca content increase, grain size decreases till wt.% 0.8Ca, the further increase affects gradual change in grain size to ~60 µm at 345°C. Therefore, increase in Ca ratio from 0.4 wt% forming to strip-like Mg-Zn intermetallics at grain boundaries, Ca-Mg-Zn ternary phase at grain boundary corners. Dramatical decrease in yield and tensile strength at wt% 1.6Ca addition is 37.6 MPa and 39.7 MPa respectively which is relatively low at 345°C due to the absence of retarded DRX'ed small particles prohibited the grain growth after the TMT process. Conversely, elongation-to-fracture increases were observed as 1.26 at 345°C showing the temperature-dependent texture softening results in improvement of mechanical properties. Wear rate is also affected from wt.% Ca addition so the gradual increase up to 1.2 wt% Ca is 3.70 x 10 -3 mm 3 /m. Similarly, a gradual increase in hardness values was obtained with Ca addition in ZK60 alloy. In this study, the effect of temperature-dependent Ca addition (wt %) on gradual enhancement in mechanical properties was observed at as-cast magnesium alloys.

Biomaterials for orthopedic applications and techniques to improve corrosion resistance and mechanical properties for magnesium alloy: a review

et al. 2023

The present study aims to collect data, compare results and assess techniques used for improving corrosion resistance and mechanical properties of biodegradable Mg alloys for fixation elements and orthopedic applications. A general description of biomaterials used for orthopedic implants is performed, including non-bioabsorbable materials. Different methods for reducing the corrosion rate in Mg alloys are researched, and the efficiencies are assessed. After evaluating different techniques, surface modification is found to be the most promising technique to reduce the corrosion rate with an efficiency of 85%. Regarding the Mg alloying agents, Zn is considered as the best candidate to improve the corrosion response and biocompatibility of the Mg.