Effect of Si and Ni on microstructure and mechanical properties of in-situ magnesium-based composites in the as-cast and extruded conditions

Salasel, Amir Reza; Abbasi, Alireza; Barri, Nima; Mirzadeh, Hamed; Emamy, M.; Malekan, Mehdi

doi:10.1016/j.matchemphys.2019.04.079

Cited by 26 publications

(10 citation statements)

References 19 publications

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“…After removing the slug and temperature control ( ∼ 750°C), the melt was poured into a preheated steel mould (150°C) for the preparation of small billets. The hot extrusion process was performed at 430°C with an extension ratio of 12:1 (d 2 1 /d 2 2 = 30 2 /8.7 2 = 11.89 ≈ 12) at a cross-head speed of 10 mm s −1 [22,23].…”

Section: Methodsmentioning

confidence: 99%

“…These estimates are almost 67% of the difference between the yield strengths of the Mg-4Si-6Ni and the Mg-4Si-6Ni-xY composites: 27, 38, and 62 MPa for the Mg-4Si-6Ni-0.3Y, Mg-4Si-6Ni-0.6Y, and Mg-4Si-6Ni-0.9Y, respectively. Another factor affecting the tensile results is the breakage of the secondary phases in the matrix [23]. As shown in Figures 3 and 4, because of the synergistic effect of hot extrusion and Y addition, the primary Mg 2 Si phase has been significantly refined.…”

Section: Tensile Propertiesmentioning

confidence: 99%

“…One of the newly discovered modifiers is nickel that enhances the properties of Mg-Si in situ composite by modifying the Mg 2 Si phase and forming a new phase [22]. By adding Ni to the Mg-Si system, the current structure is modified, and a ternary phase (Mg 8 Ni 7 Si 5 ) known as primary χ -phase with a blocky morphology is formed [23]. Another efficient factor that can has an important influence on the casting structure of the alloys and composites is hot extrusion operation, which can significantly enhance the mechanical properties [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Microstructures and mechanical performance of Mg–4Si–6Ni–xY in situ composite after extrusion process

Salehzadeh-Nobari

Emamy

Ra’ayatpour

et al. 2022

Materials Science and Technology

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The microstructures and mechanical properties of the in situ Mg–4Si–6Ni– xY ( x = 0, 0.3, 0.6, and 0.9 wt-% Y) composites were studied in this research. Y addition and hot extrusion improved ultimate tensile strength (UTS) and elongation values by refining the grains, Mg2Si intermetallic and blocky χ-phase within the structure. The addition of 0.9 wt-%Y reduced the grain size from ∼435 to ∼180 µm in the cast state and enhanced the UTS amounts from 159 MPa for the as-cast state to 295 MPa in hot extruded condition. After hot extrusion, grain refinement was an effective strengthening mechanism that increased the toughness values. Microscopic fracture studies displayed several cleavage planes in the cast state and more dimples in the extruded form.

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Section: Methodsmentioning

confidence: 99%

Section: Tensile Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructures and mechanical performance of Mg–4Si–6Ni–xY in situ composite after extrusion process

Salehzadeh-Nobari

Emamy

Ra’ayatpour

et al. 2022

Materials Science and Technology

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“…However, due to the hexagonal close-packed (HCP) structure of the magnesium matrix, its plasticity is poor, which restricts its wide application [ 3 , 4 ]. Therefore, it is necessary to obtain magnesium matrix composites with other materials through material design to overcome the above defects [ 5 , 6 ]. When using micrometer or larger-scale reinforcement, the strength of the composites is increased at the same time as the plasticity is adversely affected [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Study on Microstructure and Mechanical Properties of TC4/AZ31 Magnesium Matrix Nanocomposites

et al. 2023

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In the field of metal matrix composites, it is a great challenge to improve the strength and elongation of magnesium matrix composites simultaneously. In this work, xTC4/AZ31 (x = 0.5, 1, 1.5 wt.%) composites were fabricated by spark plasma sintering (SPS) followed by hot extrusion. Scanning electron microscopy (SEM) showed that nano-TC4 (Ti-6Al-4V) was well dispersed in the AZ31 matrix. We studied the microstructure evolution and tensile properties of the composites, and analyzed the strengthening mechanism of nano-TC4 on magnesium matrix composites. The results showed that magnesium matrix composites with 1 wt.%TC4 had good comprehensive properties; compared with the AZ31 matrix, the yield strength (YS) was increased by 20.4%, from 162 MPa to 195 MPa; the ultimate tensile strength (UTS) was increased by 11.7%, from 274 MPa to 306 MPa, and the failure strain (FS) was increased by 21.1%, from 7.6% to 9.2%. The improvement in strength was mainly due to grain refinement and good interfacial bonding between nano-TC4 and the Mg matrix. The increase in elongation was the result of grain refinement and a weakened texture.

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“…Therefore, the focus of future research on magnesium matrix composites should be around the bidirectional improvement of strength and ductility. The strength of the material is the primary factor in judging whether the material performance of military light armor is excellent, and the addition of appropriate particle reinforcement during preparation is one of the effective ways to improve the strength of the material [ 9 , 10 , 11 , 12 , 13 ]. Traditional reinforcing particles are ceramic particles such as silicon carbide [ 14 ], alumina [ 15 ], boron carbide [ 16 ], and TiC [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nano-Ti Particles on Microstructure and Mechanical Properties of Mg-3Al-1Zn Matrix Composites

et al. 2023

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In this paper, a new nanoscale metal Ti particle-reinforced Mg-3Al-1Zn matrix composite was successfully designed and prepared, which is mainly characterized by the fact that in addition to the “light” advantages of magnesium matrix composite, it also realizes bidirectional improvement of strength and ductility of the composite, and can be used as an alternative material for military light vehicle armor and individual armor. The SEM test shows that the nano-Ti particles are uniformly distributed at the grain boundary under the extruded state, which nails the grain boundary, inhibits the grain growth, and significantly refines the grain. XRD tests show that the addition of nano-Ti particles increases the crystallinity of the composite, which is consistent with the SEM test results. In addition, the EBSD test shows that the weakening of the texture of Ti/Mg-3Al-1Zn matrix composites and the increase in the starting probability of slip system are the main reasons for the improvement in ductility. Mechanical tests show that the yield strength, tensile strength, and elongation of the 0.5 wt% Ti/Mg-3Al-1Zn matrix composites exceed the peak values of ASTM B107/B107M-13 by 38.6%, 26.7%, and 20%, respectively.

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Effect of Si and Ni on microstructure and mechanical properties of in-situ magnesium-based composites in the as-cast and extruded conditions

Cited by 26 publications

References 19 publications

Microstructures and mechanical performance of Mg–4Si–6Ni–xY in situ composite after extrusion process

Microstructures and mechanical performance of Mg–4Si–6Ni–xY in situ composite after extrusion process

Study on Microstructure and Mechanical Properties of TC4/AZ31 Magnesium Matrix Nanocomposites

Effect of Nano-Ti Particles on Microstructure and Mechanical Properties of Mg-3Al-1Zn Matrix Composites

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