Effects of bonding temperature on microstructure and mechanical properties of diffusion-bonded joints of as-cast Mg–Gd alloy

Tong, Xin; Zai, Le; You, Guoxiang; Wu, Hong; Wen, Hao; Liu, Siyuan

doi:10.1016/j.msea.2019.138408

Cited by 36 publications

(4 citation statements)

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“…These grain boundary migration phenomena are reported in diffusion welding. [39,40] During the process of IFW, the maximum temperature from the WZ (heat source) to the BM decreases continuously. Therefore, the area closer to the WZ has a lower YS, and consequent higher degree of deformation decreases the recrystallization temperature.…”

Section: Discussionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Inertia‐Friction‐Welded Fe–Cr–Ni–Mo High‐Strength Steel

Zai

You

Tong

et al. 2020

steel research int.

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Inertia friction welding (IFW) is a solid‐state welding technology that avoids defects associated with molten weld processes; however, this process has rarely been used to weld ultrahigh‐strength steel (UHSS). Herein, 32CrMnSi2Ni6MoV UHSS is joined successfully via IFW. The mechanical properties after welding at different rotational speeds and the microstructure at 2800 rpm are studied in detail. The temperature distributions in the peripheral and central areas are modeled according to the temperature at the weld zone. The microstructural transformation is analyzed for different temperature intervals, and the microstructural characteristics of each interval correspond to the actual microstructure of the welded joint according to the temperature distribution model. High‐strength martensite forms at the weld zone, and the thermomechanical‐affected zone (TMAZ) in the peripheral region is divided into phase transformation zone, partial recrystallization zone, and plastic deformation zone, whereas the TMAZ in the central region includes only the partial recrystallization and pure plastic deformation zones. This difference is due to the higher frictional heat caused by the higher peripheral linear velocity during rotation. A tensile test shows that fracture occurs in the base metal (BM) region, and the yield strength, tensile strength, and elongation are 805 MPa, 1064 MPa, and 13.88%, respectively.

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Section: Discussionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Inertia‐Friction‐Welded Fe–Cr–Ni–Mo High‐Strength Steel

Zai

You

Tong

et al. 2020

steel research int.

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“…However, the size of those precipitated phases distributed on the grain boundary becomes growing, which leads to the fact that crack sources initiate near the precipitates and propagate along with the phase interface. [ 27,28 ] As a result, for the as‐cat LZY alloys, when the contents of the Zn and Y were continuously increased from 3 and 1 wt% to 2 and 6 wt%, respectively, the EL of the alloy decreased apparently.…”

Section: Discussionmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties of As‐Cast and As‐Extruded Mg–14Li Alloy with Different Zn/Y and Zn/Gd Addition

et al. 2020

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Magnesium-lithium alloy is the lightest metal engineering material, which possesses broad applications in the domains of aviation industries and military affairs because of its remarkable advantages, such as perfect electromagnetic shielding, damping properties, and superhigh specific stiffness and strength. Among those significant superiorities, its lower density is the most brilliant feature, which is 1/4-1/3 lighter than that of ordinary magnesium alloys, and almost 1/2 of aluminum alloys. [1-5] In addition, there exists an interest and important structure transformation from hexagonal close-packed (hcp) to bodycentered cubic (bcc) with the increasing Li content in binary Mg-Li alloys, which can reduce the crystal parameter (c/a ratio) of α-Mg and activate more non-basal slip systems. When the mass fraction of Li contents is more than 5.7 wt%, Mg-Li alloy presents a typical duplex-phase structure, which consists of α-Mg (hcp) and β-Li (bcc) phases. Moreover, when Li contents exceed 10.3 wt%, the microstructure of the alloy will be transformed from the duplex phase (α þ β) to single phase (β). [6-12] LA141 (Mg-14Li-1Al) is a kind of superlight alloy (1.333 g cm À3) among the commercial Mg-Li alloys. However, its wide uses are limited by existing problems involving low strength, weak anti-corrosion, and worse age hardening stability. Therefore, it has great significance to improve the performance of the superlight Mg-14Li-based alloy. [13-16] Optimal alloying addition might offer an attractive alternative. Shechtman was the first to discover quasicrystals in magnesium alloys in 1984. The atomic arrangement of quasicrystals is quite different from that of traditional crystals and amorphous alloys, which can significantly improve the comprehensive properties of magnesium alloys. [17-23] In recent years, the idea of quasicrystalline strengthening has been used for reference in the study of Mg-Li alloys. The addition of rare earth elements (RE), such as Y and Gd, to Mg-Li-Zn alloys can produce quasicrystalline strengthening phases with hightemperature stability and other kinds of mesophase strengthening matrices. In addition, Y and Gd have relatively higher solid solubility in the α-Mg matrix. [24] However, there are few reports about the strengthening effect of Zn/Y and Zn/Gd addition on Mg-Li alloy with single β-Li phase. Accordingly, elements Zn, Y, and Gd were added to the chosen Mg-14Li-based alloy. Therefore, Mg-14Li-2Zn-1Y (named LZY1421), Mg-14Li-3Zn-1Y (named LZY1431), Mg-14Li-6Zn-2Y (named LZY1462) and Mg-14Li-2Zn-1Gd (named LZG1421), Mg-14Li-3Zn-1Gd (named LZG1431), Mg-14Li-6Zn-2Gd (named LZG1462) alloys were prepared as

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“…The microstructure typically exhibits aspects of as-melted metallic alloys with Mg 2 Ca tabular intermetallic structures and particles of Mg 5 Gd which are proportionally equably distributed. The enhancement with Gd shows the growth of round particles with a separation trend of somewhat uniformly distributed black dots [48]. The structural appearance of the SEM images of the said specimens is shown in Figure 2 and the existence of an intermetallic stage is noticeable.…”

Section: Microstructural Analysismentioning

confidence: 91%

“…In quantitative terms, the percentage of Gd significantly influenced the behavior of the alloy at values higher than 2 wt.% of Gd. It is known that both intermetallic compounds have a significant influence on the electro-corrosion resistance of Mg-based materials [48,49]. The open circuit potential (OCP) shows close values for all samples, decreasing with the elevated percentage of the alloying element.…”

Section: Electrochemical Corrosion Resistance Analysismentioning

confidence: 99%

Microstructural, Electrochemical and In Vitro Analysis of Mg-0.5Ca-xGd Biodegradable Alloys

et al. 2021

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The subject of Mg-based biodegradable materials, used for medical applications, has been extensively studied throughout the years. It is a known fact that alloying Mg with biocompatible and non-toxic elements improves the biodegradability of the alloys that are being used in the field of surgical applications. The aim of this research is to investigate the aspects concerning the microstructure, electrochemical response (corrosion resistance) and in vitro cytocompatibility of a new experimental Mg-based biodegradable alloy—Mg–0.5%Ca with controlled addition of Gd as follows: 0.5, 1.0, 1.5, 2.0 and 3.0 wt.%—in order to establish improved biocompatibility with the human hard and soft tissues at a stable biodegradable rate. For this purpose, scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), light microscopy (LM) and X-ray diffraction (XRD) were used for determining the microstructure and chemical composition of the studied alloy and the linear polarization resistance (LPR) method was used to calculate the corrosion rate for the biodegradability rate assessment. The cellular response was evaluated using the 3-(4,5-dimethyltiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) test followed by fluorescence microscopy observation. The research led to the discovery of a dendritic α-Mg solid solution, as well as a lamellar Mg2Ca and a Mg5Gd intermetallic compound. The in vivo tests revealed 73–80% viability of the cells registered at 3 days and between 77 and 100% for 5 days, a fact that leads us to believe that the experimental studied alloys do not have a cytotoxic character and are suitable for medical applications.

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Effects of bonding temperature on microstructure and mechanical properties of diffusion-bonded joints of as-cast Mg–Gd alloy

Cited by 36 publications

References 50 publications

Microstructure and Mechanical Properties of Inertia‐Friction‐Welded Fe–Cr–Ni–Mo High‐Strength Steel

Microstructure and Mechanical Properties of Inertia‐Friction‐Welded Fe–Cr–Ni–Mo High‐Strength Steel

Microstructural Evolution and Mechanical Properties of As‐Cast and As‐Extruded Mg–14Li Alloy with Different Zn/Y and Zn/Gd Addition

Microstructural, Electrochemical and In Vitro Analysis of Mg-0.5Ca-xGd Biodegradable Alloys

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