The formation of bulk β-Al3Ni phase in eutectic Al-5.69wt%Ni alloy solidified under high pressure

Wang, X.H.; Ran, Zhi Hua; Wei, Zunjie; Zou, Chaoying; Wang, H.W.; Gouchi, Jun; Uwatoko, Yoshiya

doi:10.1016/j.jallcom.2018.01.272

Cited by 24 publications

(5 citation statements)

References 28 publications

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“…Few B2 phase particles can also be found in the Ti-48Al-2Cr alloy when solidified under ambient pressure, as shown in Figure 3b (the content of the B2 phase is less and cannot be detected by XRD), but no B2 phase was found after solidification under high pressure. This is because the B2 phase is the result of the ordering of the primary β phase at high temperature [38]; high-pressure solidification can increase the undercooling of the melt and directly lead to the formation of the α phase from the liquid phase [26]. Meanwhile, high pressure inhibits the diffusion which leads to the increasing of Al content in the liquid phase [26].…”

Section: Microstructure Of the Ti-48al-2cr Alloy Solidified Under Dif...mentioning

confidence: 99%

“…This is because the B2 phase is the result of the ordering of the primary β phase at high temperature [38]; high-pressure solidification can increase the undercooling of the melt and directly lead to the formation of the α phase from the liquid phase [26]. Meanwhile, high pressure inhibits the diffusion which leads to the increasing of Al content in the liquid phase [26]. The content of Al element in the liquid phase will increase, which can also promote the peritectic phase, direct nucleation, and precipitation.…”

Section: Microstructure Of the Ti-48al-2cr Alloy Solidified Under Dif...mentioning

confidence: 99%

“…These characteristics are different from alloys that have solidified under ambient pressure. Wang et al [26] confirmed that high pressure increases the eutectic point from 5.69% under ordinary pressure to 26.49% under 2 GPa, and the velocity of dilute solute solidified at interface declines exponentially. Wei et al [27] reported the tensile strength and yield strength of Al-20Mg alloy increased to 467 MPa and 245 MPa respectively, because of solution strengthening and deformation strengthening caused by high pressure heat treatment.…”

Section: Introductionmentioning

confidence: 97%

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Microstructure and Nanohardness of Ti-48Al-2Cr Alloy Solidified under High Pressure

et al. 2020

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In this work, the Ti-48Al-2Cr alloy, solidified under different pressures and temperatures, was investigated in detail. The effect of high pressure on the microstructure and nanohardness of the Ti-48Al-2Cr alloy was investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and a nanoindenter XP testing machine. The results showed that the B2 phase disappeared after high-pressure solidification. Compared with ambient pressure solidification, high pressure led to the increase of (α2 + γ) lamellar structure and the decrease of γ phase. The nanohardness of the lamellar structure was discussed based on the microstructure observation. When solidified at 5 GPa/1873 K, the hardness rose to 5.54 GPa, an increase of 60.5% compared with that solidified at ambient pressure. However, the increased holding temperature of 1973 K made the dislocation density in the lamellar structures greatly decrease, and reduced the structure’s hardness to 4.48 GPa.

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Section: Microstructure Of the Ti-48al-2cr Alloy Solidified Under Dif...mentioning

confidence: 99%

Section: Microstructure Of the Ti-48al-2cr Alloy Solidified Under Dif...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Microstructure and Nanohardness of Ti-48Al-2Cr Alloy Solidified under High Pressure

et al. 2020

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“…Among them, pressure is one of the basic thermodynamic parameters that affect the solidification process, which greatly affects the solidification process of the alloy [11][12][13]. The diffusion coefficient of solute is significantly decreased under high-pressure solidification conditions and consequently refines the second phase and change its morphology [14,15], which leads to a significant enhancement of the mechanical properties of the alloy [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of aging treatment on properties of Al–Si alloy solidified at high-pressure

Huang

Jiang

et al. 2023

Materials Science and Technology

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The thermal conductivity and microhardness of the high-pressure solidified Al–Si-Fe-Mg alloys can be significantly improved by a large number of solute atoms precipitated and hence released the lattice distortion after aging for 12 h. And the α-Al lattice constant does not change significantly during the aging treatment from 12 h to 24 h, indicating the alloy released less lattice distortion. The interface between the precipitated phase and the α-Al matrix gradually evolved into an incoherent relationship with the extension of aging time, which has a greater hindering effect on the thermal conductivity of the alloy, and the amount of precipitated phase will be the primary factor in decreasing the thermal conductivity of the alloy at this point.

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“…The production of composite materials with a metal matrix on the basis of aluminum alloys has wide application prospects, since it allows us to obtain products with a hardened structure of individual components of the product, while retaining the properties of the base metal with low cost and density, as well as high plasticity [13][14][15][16][17]. The use of modern production methods makes it possible to produce lightweight nickel-modified aluminum products that are resistant to frictional wear due to hardening with Al 3 Ni intermetallic particles [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. The bulk intermetallic phase of Al 3 Ni exhibits an orthorhombic crystal structure and has a density of 4000 kg/m 3 and an elastic modulus of 140 MPa [34].…”

Section: Introductionmentioning

confidence: 99%

Al–Al3Ni In Situ Composite Formation by Wire-Feed Electron-Beam Additive Manufacturing

et al. 2023

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The regularities of microstructure formation in samples of multiphase composites obtained by additive electron beam manufacturing on the basis of aluminum alloy ER4043 and nickel superalloy Udimet-500 have been studied. The results of the structure study show that a multicomponent structure is formed in the samples with the presence of Cr23C6 carbides, solid solutions based on aluminum -Al or silicon -Si, eutectics along the boundaries of dendrites, intermetallic phases Al3Ni, AlNi3, Al75Co22Ni3, and Al5Co, as well as carbides of complex composition AlCCr, Al8SiC7, of a different morphology. The formation of a number of intermetallic phases present in local areas of the samples was also distinguished. A large amount of solid phases leads to the formation of a material with high hardness and low ductility. The fracture of composite specimens under tension and compression is brittle, without revealing the stage of plastic flow. Tensile strength values are significantly reduced from the initial 142–164 MPa to 55–123 MPa. In compression, the tensile strength values increase to 490–570 MPa and 905–1200 MPa with the introduction of 5% and 10% nickel superalloy, respectively. An increase in the hardness and compressive strength of the surface layers results in an increase in the wear resistance of the specimens and a decrease in the coefficient of friction.

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The formation of bulk β-Al3Ni phase in eutectic Al-5.69wt%Ni alloy solidified under high pressure

Cited by 24 publications

References 28 publications

Microstructure and Nanohardness of Ti-48Al-2Cr Alloy Solidified under High Pressure

Microstructure and Nanohardness of Ti-48Al-2Cr Alloy Solidified under High Pressure

Effect of aging treatment on properties of Al–Si alloy solidified at high-pressure

Al–Al3Ni In Situ Composite Formation by Wire-Feed Electron-Beam Additive Manufacturing

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