Microstructure Evolution of the Mg-5.8 Zn-0.5 Zr-1.0 Yb Alloy During Homogenization

Li, Lü; Jiang, Wei; Guo, Peitao; Yu, Wenbin; Wang, Fang; Pan, Zhiyuan

doi:10.1590/1980-5373-mr-2016-1103

Cited by 11 publications

(8 citation statements)

References 26 publications

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“…Identifying strong peaks corresponding to Mg-Zn intermetallics is difficult as the fraction of these phases is lower. However, the peaks with lower intensities were observed and identified by comparing with the available literature [19,20] before heat treatment. The corresponding intensities were observed as decreased after heat treatment at 300 °C that indicates the reduced MgZn 2 phase.…”

Section: Resultsmentioning

confidence: 99%

Effect of heat treatment on microstructure, microhardness and corrosion resistance of ZE41 Mg alloy

Syam

Kondaiah²,

Akhil

et al. 2019

Koroze a Ochrana Materialu

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Magnesium and its alloys are now attracting a great attention as promising materials for several light weight engineering applications. ZE41 is a new Mg alloy contains Zinc, Zirconium and Rare Earth elements as the important alloying elements and is widely used in aerospace applications. In the present study, heat treatment has been carried out at two different temperatures (300 and 335 °C) to assess the effect of heat treatment on microstructure and corrosion behavior of ZE41 Mg alloy. The grain size was observed as almost similar for the unprocessed and heat treated samples. Decreased amount of secondary phase (MgZn2) was observed after heat treating at 300 °C and increased intermetallic phase (Mg7Zn3) and higher number of twins appeared for the samples heat treated at 335 °C. Microhardness measurements showed increased hardness after heat treating at 300 °C and decreased hardness after heat treating at 335 °C which can be attributed to the presence of higher supersaturated grains after heat treating at 300 °C. The samples heat treated at 335 °C exhibited better corrosion resistance compared to those of base materials and samples heat treated at 300 °C. From the results, it can be understood that the selection of heat treatment temperature is crucial that depends on the requirement i.e. to improve the microhardness or at the loss of microhardness to improve the corrosion resistance of ZE41 Mg alloy.

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Section: Resultsmentioning

confidence: 99%

Effect of heat treatment on microstructure, microhardness and corrosion resistance of ZE41 Mg alloy

Syam

Kondaiah²,

Akhil

et al. 2019

Koroze a Ochrana Materialu

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“…[17] When Zr content exceeds 0.6 wt% in Mg alloys, it begins to precipitate in form of α-Zr particle to achieve grain refinement. [18,19] Moreover, the addition of Zn element in Mg alloys promotes the formation of Mg 17 Zn 12 , Mg 7 Zn 3 , and MgZn, [20,21] which can be used as main components of secondary phases to realize precipitation strengthening of Mg alloys. Therefore, the casting combination of Mg-Zn-Zr alloy is prospective to obtain outstanding compressive strength to ensure the stability and pressurizing capacity of the dissolution process in corrosive environments.…”

Section: Introductionmentioning

confidence: 99%

Corrosion decomposition and mechanical behaviors of As‐cast Mg–xZn–Zr alloys

Zhou

Tian

et al. 2020

Materials & Corrosion

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Developing new‐type alloy materials with excellent decomposition properties and mechanical behaviors is a thorny issue for preparing fracturing balls in oil exploitation. As‐cast Mg–xZn–Zr alloys designed by regulating Zn contents have been fabricated in this study. Compressive strength and immersion corrosion test have been investigated to assess their feasibility as decomposition materials. Scanning electron microscopy and X‐ray diffract meter have also been used to characterize surface morphologies and phase structures for determining their decomposition mechanism. Results show that matrix phases and secondary phases with discontinuous reticular features form on the alloys. They also achieve excellent mechanical properties to ensure stability and pressure‐maintaining capacity in the decomposition process in chloride environment. Meanwhile, with Zn content and immersion time increasing, galvanic corrosion effect strengthens leading to accelerated specific mass loss rates of the alloys. Rapid corrosion decomposition of the alloys mainly attributes to anodic dissolution of matrix phases, exfoliation of microparticles, and poor resistance of corrosion products to the decomposition process. This study provides positive insight into the preparation of new‐type Mg alloys for guaranteeing fast decomposition of fracturing balls and also ensuring their compressive strength stability.

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“…The percentage of Mg-Zn intermetallic phases is minimal, making it difficult to identify prominent peaks. However, by comparing with the literature, the peaks with lesser intensities were detected [20]. Following the heat treatment at 300 °C, the corresponding intensities were observed to have dropped, which is indicative of the reduced MgZn 2 phase.…”

Section: Xrd Analysismentioning

confidence: 55%

Effect of Annealing Treatment on (Mg<sub>17</sub>Al<sub>12</sub>) Phase Characterization and Corrosion Behavior in Different Solutions for AZ91 Alloy

Abass¹,

Abdulkareem²,

Hussein³

2023

Adv. Sci. Technol. Res. J.

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Heat treatment is the most suitable technique for altering the microstructure and, consequently, it is possible to create the optimal balance of corrosion resistance and mechanical strength in a material by carefully regulating the conditions during the heating process. The present work aims to investigate the effect of heat treatments (annealing) at 300 °C, at different times (10, 20, and 30 h) on the magnesium alloy. How the Mg 17 Al 12 phase influences the corrosion behavior of AZ91D magnesium alloy was quantified in different solution (SBF, Lactic and Ringer). It was able to construct an extensive range of Mg 17 Al 12 phase volume fractions by varying the annealing period. The corrosion potential of many specimens with varied proportions of the Mg 17 Al 12 phase was evaluated. The results of the conducted tests manifested that the material's resistance to corrosion greatly improved with an increase in the volume fraction of Mg 17 Al 12 phase. The effect of heat treatment on the microstructure was analyzed using transmission electron microscopy and X-ray diffraction. The SEM photographs evinced that the amount of β-Mg 17 Al 12 phase decreased significantly, with the distribution occurring at the grain boundaries and with increasing the time of annealing, resulting in a highly saturated α-grain. The XRD validated the all material peaks of phases that are present. The corrosion test behavior of AZ91 alloy in the simulated body fluid (SBF), lactic, and Ringer solutions was investigated through electrochemical measurements, the result was elucidated as measured along the Tafel slope, and the corrosion current density of all heat treated samples was lower than that of the as-cast sample. The measurement of hardness (HV) demonstrated that the hardness decreased to 64.5 HV0.5 during the heat treatment. The result antibacterial efficiency was revealed that AZ91 at 30 hr was best then as cast against the bacteria E.coli.

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Microstructure Evolution of the Mg-5.8 Zn-0.5 Zr-1.0 Yb Alloy During Homogenization

Cited by 11 publications

References 26 publications

Effect of heat treatment on microstructure, microhardness and corrosion resistance of ZE41 Mg alloy

Effect of heat treatment on microstructure, microhardness and corrosion resistance of ZE41 Mg alloy

Corrosion decomposition and mechanical behaviors of As‐cast Mg–xZn–Zr alloys

Effect of Annealing Treatment on (Mg<sub>17</sub>Al<sub>12</sub>) Phase Characterization and Corrosion Behavior in Different Solutions for AZ91 Alloy

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