Rapid solidification kinetics and mechanical property characteristics of Ni–Zr eutectic alloys processed under electromagnetic levitation state

Wang, H.P.; Lü, Peng; Cai, X.; Zhai, B.; Jinghui, Zhao; Wei, B.

doi:10.1016/j.msea.2019.138660

Cited by 50 publications

(8 citation statements)

References 37 publications

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“…As shown in our previous work, in Ni 3 Al-based superalloy γ matrix with γ′ particles first segregates from melt, forming the dendrites and eutectic zone (γ′-γ) [39]. However, solidification of Ni-based superalloy shows that only γ solid solution exists in dendrites [40], and transformation in the remaining liquid is complicated [41]. The increase in the solidification cooling rate can increase the nucleation of γ-phase solid solution [40].…”

Section: Effect Of Cooling Rate On Nucleation Of Primary γ′mentioning

confidence: 66%

“…However, solidification of Ni-based superalloy shows that only γ solid solution exists in dendrites [40], and transformation in the remaining liquid is complicated [41]. The increase in the solidification cooling rate can increase the nucleation of γ-phase solid solution [40]. Furthermore, the cooling rate after solid solution treatment is also important for γ′ phase.…”

Section: Effect Of Cooling Rate On Nucleation Of Primary γ′mentioning

confidence: 99%

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Microstructure Evolution of Primary γ′ Phase in Ni3Al-Based Superalloy

Zhang

Peng

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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In this work, water cooling, air cooling (AC) and furnace cooling (FC) were applied to investigate the effect of cooling rate on microstructure evolution of primary γ′ in a newly designed Ni 3 Al-based alloy. The results showed that nucleation rate of primary γ′ increased with increasing cooling rate. In addition, higher cooling rate shortened growth period of primary γ′, which made its morphology close to the initial precipitated γ′. For AC and FC specimens, due to the lower cooling rate, primary γ′ possessed longer growth period and its morphology was mainly due to the evolution of lattice misfit between γ and primary γ′. Meanwhile, growth of primary γ′ depended on lattice misfit distribution between its corner and edge area. Moreover, primary γ′ morphologies of sphere, cube and concave cube with tip corners were illustrated by considering interaction between elemental diffusion and elastic strain energy.

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Section: Effect Of Cooling Rate On Nucleation Of Primary γ′mentioning

confidence: 66%

Section: Effect Of Cooling Rate On Nucleation Of Primary γ′mentioning

confidence: 99%

Microstructure Evolution of Primary γ′ Phase in Ni3Al-Based Superalloy

Zhang

Peng

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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“…In addition, the mechanical properties of Ni–Zr hypereutectic alloy have been researched by EML. [ 19 ] When the alloy was undercooled at 140 K, the maximum compression strength was 2.8 GPa, and the plastic strain of 47% was reached, which were about 2.6 and 3 times higher than that with undercooling of 20 K, respectively. In fact, the alloy whether with large or small undercooling performs much better properties compared with traditional methods, which desires to further investigation and application.…”

Section: Introductionmentioning

confidence: 99%

Connecting Solidified Microstructure with Compression Properties for Bulk Ti–Al Alloys with V Addition Conducted by Electromagnetic Levitation and First Principle

et al. 2022

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Bulk Ti–Al based alloys with an approximate mass of 30 g are first prepared by electromagnetic levitation. The microstructures and the compression properties of Ti‐45%Al‐z%V alloys (z = 4, 8, and 12, atomic percent) at room and high temperatures are studied by experiments. The relationship between V content and the mechanical properties of γ and α2 intermetallics has been investigated by first‐principle calculations. It is clarified that V addition controls the phase contents and the microstructure characteristics. With the increase of V content, the microstructures of Ti‐45%Al‐4%V and Ti‐45%Al‐12%V are dominated by the phase transformations of α → γ and α → α2, respectively. Ti‐45%Al‐4%V alloy is mainly constituted of fine full lamellar γ phase while Ti‐45%Al‐12%V alloy is composed of coarsening lath α2 phase. Besides, the Young's modulus of Ti‐45%Al‐12%V alloy is smaller than that of Ti‐45%Al‐4%V alloy at 300 K, but the yield stress and ultimate compression stress are larger than that of Ti‐45%Al‐4%V alloy. The differences are attributed to the change of the main phase from γ to α2 and the mechanical properties of crystals changed by V addition. In addition, V addition changes the Young's modulus of α2 crystal from isotropy to anisotropy.

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“…Electromagnetic levitation (EML) is a suitable technique for achieving an undercooled state [6][7][8]. As a typical rapid solidification technology, the EML has been applied to investigate the solidification behavioural characteristics of semiconductors [9][10][11]. Li et al [12] studied the microstructural evolution of silicon using a two-step heating method by containerless processing, and achieved a maximum undercooling temperature of ∼ 420 K by slowly cooling.…”

Section: Introductionmentioning

confidence: 99%

Critical undercooling of growth mode transition in undercooled Al-80%Si-1.0%P alloy

Dang

Jian

2022

Materials Science and Technology

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Herein, the critical undercooling of growth mode transitions in highly undercooled Al-80%Si-1.0%P alloys were investigated by high-speed video to observe and record the growth process. Under low undercooling, the dendrites with special edges of primary silicon solidify from the undercooled melt and show lateral growth characteristics. As undercooling increases, the primary silicon grows as blocky and dendritic shapes, indicating mixed growth characteristics. With sufficiently high undercooling, the sample's surface exhibits the equiaxed primary silicon and shows non-lateral growth characteristics. The experimentally determined critical undercooling for the growth mode transition of primary silicon in undercooled Al-80%Si-1.0%P alloys are 125 and 225 K, and are consistent with the theoretically predicted values, 112 and 208 K, respectively.

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Rapid solidification kinetics and mechanical property characteristics of Ni–Zr eutectic alloys processed under electromagnetic levitation state

Cited by 50 publications

References 37 publications

Microstructure Evolution of Primary γ′ Phase in Ni3Al-Based Superalloy

Microstructure Evolution of Primary γ′ Phase in Ni3Al-Based Superalloy

Connecting Solidified Microstructure with Compression Properties for Bulk Ti–Al Alloys with V Addition Conducted by Electromagnetic Levitation and First Principle

Critical undercooling of growth mode transition in undercooled Al-80%Si-1.0%P alloy

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