Microstructure, mechanical properties and strengthening mechanisms of Mg matrix composites reinforced with in situ nanosized TiB2 particles

Xiao, Peng; Gao, Yimin; Yang, Congqiao; Liu, Zhiwei; Li, Yefei; Xu, Fengyu

doi:10.1016/j.msea.2017.10.107

Cited by 118 publications

(22 citation statements)

References 44 publications

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“…Furthermore, due to the equiaxed Mo2FeB2 particles, the microcracks are more likely to propagate in the Fe binder phase, which absorbs a lot of energy and leads to the improvement of TRS of Mo2FeB2based cermets. Additionally, presence of equiaxed Mo2FeB2 hard phase in cermets will change the direction of crack propagation, causing the crack bridging, branching and deflection [46,47]. As shown in the fracture surface with 0 wt.% and 1.0 wt.% Ti contents, less pores are observed in cermets without Ti, which shows good densification of cermets.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Sintering Mechanism, Microstructure Evolution, and Mechanical Properties of Ti-Added Mo2FeB2-Based Cermets

et al. 2020

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Four series of Mo2FeB2-based cermets with Ti contents between 0 wt.% and 1.5 wt.% in 0.5 wt.% increments were prepared by in situ reaction and liquid phase sintering technology. Influences of Ti on microstructure and mechanical properties of cermets were studied. It was found that Ti addition increases formation temperatures of liquid phases in liquid-phase stage. Ti atoms replace a fraction of Mo atoms in Mo2FeB2 and the solution of Ti atoms causes the Mo2FeB2 crystal to be equiaxed. In addition, the cermets with 1.0 wt.% Ti content exhibit the smallest particle size. The solution of Ti atoms in Mo2FeB2 promotes the transformation of Mo2FeB2 particles from elongated shape to equiaxed shape. With Ti content increasing from 0 wt.% to 1.5 wt.%, the hardness and transverse rupture strength (TRS) first increase and then decrease. The maximum hardness and TRS occur with 1.0 wt.% Ti content. However, the fracture toughness decreases as Ti content increases. The cermets with 1.0 wt.% Ti content show excellent comprehensive mechanical properties, and the hardness, fracture toughness, and TRS are HRA 89.5, 12.9 MPa∙m1/2, and 1612.6 MPa, respectively.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Sintering Mechanism, Microstructure Evolution, and Mechanical Properties of Ti-Added Mo2FeB2-Based Cermets

et al. 2020

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“…The The enhanced strength of Mg-TiB2 nanocomposites may have been resulted from not only the load-carrying capacity of nano-TiB2 particles but also from the inhibition of dislocation movement by nano-TiB2 particles, the reduction of grain size due to nano-TiB2 particles, and increasing the number of dislocations due to Orowan strengthening mechanism and thermal expansion coefficient mismatch of Mg matrix and nano-TiB2 particles [21]. Nano-particles act as obstacles against to grain growth during sintering process.…”

Section: Compressive Propertiesmentioning

confidence: 99%

“…In addition to SiC, Al2O3, TiC, and B4C [20], TiB2 is another ceramic-based particle used as a reinforcement in Mg-based metal matrix composites due to high hardness, elastic modulus, strength to density ratio, and wear resistance [21]. Rather than using the SPS process, the researchers studied Mg-TiB2 composites which were produced through solid-state methods such as cold-pressing+sintering and hot pressing [4,22,23].…”

Section: Introductionmentioning

confidence: 99%

Electrical, Thermal, and Mechanical Properties of Mg-TiB2 Nanocomposites Produced by Spark Plasma Sintering

Diler

2021

International Journal of Advances in Engineering and Pure Sciences

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Monolithic magnesium was reinforced with nano-TiB2 particles to produce Mg-TiB2 nanocomposites, and the effects of nano-TiB2 particles on the electrical, thermal, and mechanical properties of Mg matrix nanocomposites were studied. Monolithic Mg and Mg-TiB2 nanocomposites were manufactured using spark plasma sintering process. Both analytical and experimental findings revealed that the electrical and thermal conductivities of Mg-TiB2 nanocomposites were lower than those of monolithic Mg and decreased as the amount of nano-TiB2 particles increased. The electrical and thermal conductivities of Mg-TiB2 nanocomposites decreased at a higher rate for a higher weight fraction of nano-TiB2 particles. The experimental electrical and thermal conductivities of Mg-TiB2 nanocomposites at a certain amount of nano-TiB2 particles was measured at lower values than those obtained by analytical calculations. The compressive strength of Mg-TiB2 nanocomposites was higher than that of monolithic Mg and improved as the weight fraction of nano-TiB2 particles increased; however, a high amount of nano-TiB2 particles resulted in a decrease in compressive strength. The compressive strength of Mg-TiB2 nanocomposite with 1.5wt.% nano-TiB2 particles improved by 34%; on the other hand, its failure strain decreased by 12% compared to monolithic Mg.

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“…Therefore, the yield strength increases with the increase of particle volume fraction. (ii) The increase of particle contents would generate geometrically necessary dislocations at the interface due to the difference between elastic modulus and coefficients of thermal expansion (CTE) of SiCp and magnesium [23]. Thus, composites yield strength increased as the particle contents increase from 5vol.% to 20vol.%.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…The well-known Hall-Petch relation Eq. (2) indicates the effect of grain size on the strength of a material [24].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Microstructures, interface structure and room temperature tensile properties of magnesium materials reinforced by high content submicron SiCp

Shen

Zhang

Ying

2019

Science and Engineering of Composite Materials

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The present work aims to research the treatment processing of magnesium reinforced with 1 μmsilicon carbide particle (SiCp) using stir casting combined by ultrasonic vibration. Present studies have been done on six different materials: (a) AZ31B alloy without particles, (b) 5 vol.% SiCp/AZ31B composites fabricated with different semi-solid stirring time (5 min, 10 min, 15 min and 20 min), (c) composite with 20 vol.% SiCp. The effects of 1 μm/SiCp pretreatment and stirring time on microstructure and interfacial wettability as well as mechanical properties of the materials were confirmed. Both short and long stirring time for the particle dispersion brought particle agglomeration. Results of SEM microstructure and tensile properties exhibited that the optimal stirring parameters of 625 °C/1500 rpm/15 min are exploited, and 20 vol.% SiCp/AZ31B composite was fabricated by the optimal stirring parameters. The application of optimal stirring parameters for the treatment resulted in homogeneous particle distribution. The addition of SiCp leads to a reduced matrix grain, and 20 vol.% SiCp/AZ31B composite showed smaller grain size than. 5 vol.% SiCp/AZ31B composite. The interface between SiCp and matrix is clear and interfacial wettability well. Tensile test results show that with increasing SiCp content, strengths increase while ductility decreases.

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Microstructure, mechanical properties and strengthening mechanisms of Mg matrix composites reinforced with in situ nanosized TiB2 particles

Cited by 118 publications

References 44 publications

Sintering Mechanism, Microstructure Evolution, and Mechanical Properties of Ti-Added Mo2FeB2-Based Cermets

Sintering Mechanism, Microstructure Evolution, and Mechanical Properties of Ti-Added Mo2FeB2-Based Cermets

Electrical, Thermal, and Mechanical Properties of Mg-TiB2 Nanocomposites Produced by Spark Plasma Sintering

Microstructures, interface structure and room temperature tensile properties of magnesium materials reinforced by high content submicron SiCp

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