Dendritic Growth and Microstructure Evolution with Different Cooling Rates in Ti48Al2Cr2Nb Alloy

Yi Liu; Rui Hu; Tiebang Zhang; Hongchao Kou; Jun Wang; Guang Yang; Jinshan Li

doi:10.1007/s11665-015-1696-6

Dendritic Growth and Microstructure Evolution with Different Cooling Rates in Ti48Al2Cr2Nb Alloy

Yi Liu, Rui Hu, Tiebang Zhang, Hongchao Kou, Jun Wang, Guang Yang, Jinshan Li

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

The influence of cooling rates on the dendritic growth and microstructure evolution of Ti48Al2Cr2Nb alloy is studied by electromagnetic levitation combined with copper mold casting. The different cooling rates of the conical as-cast sample with diameters from 4.7 to 0.8 mm were calculated by ANSYS software. The results show that primary dendrite arm spacing decreases with increase in cooling rate. Peritectic transformation (L + β → α) and the transformation of α → (α₂ + γ) are restrained at cooling rate of 2.3 × 10⁴ K s⁻¹. With further increase in cooling rate (2.6 × 10⁴ K s⁻¹), a fine and homogeneous microstructure can be observed in the conical casting sample with the diameter of 0.8 mm. It consists of a large amount of massive γ phase, lath-like γ phase, and only few lamellar structures (α₂ + γ). The formation of the microstructure in the alloy is attributed to the strong chilling, giving rise to the high undercooling and the high dislocation density during rapid solidification.

Original language	English
Pages (from-to)	38-45
Number of pages	8
Journal	Journal of Materials Engineering and Performance
Volume	25
Issue number	1
DOIs	https://doi.org/10.1007/s11665-015-1696-6
State	Published - 1 Jan 2016

Keywords

cooling rate
dendritic growth
massive γ phase
microstructure evolution

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title = "Dendritic Growth and Microstructure Evolution with Different Cooling Rates in Ti48Al2Cr2Nb Alloy",

abstract = "The influence of cooling rates on the dendritic growth and microstructure evolution of Ti48Al2Cr2Nb alloy is studied by electromagnetic levitation combined with copper mold casting. The different cooling rates of the conical as-cast sample with diameters from 4.7 to 0.8 mm were calculated by ANSYS software. The results show that primary dendrite arm spacing decreases with increase in cooling rate. Peritectic transformation (L + β → α) and the transformation of α → (α2 + γ) are restrained at cooling rate of 2.3 × 104 K s−1. With further increase in cooling rate (2.6 × 104 K s−1), a fine and homogeneous microstructure can be observed in the conical casting sample with the diameter of 0.8 mm. It consists of a large amount of massive γ phase, lath-like γ phase, and only few lamellar structures (α2 + γ). The formation of the microstructure in the alloy is attributed to the strong chilling, giving rise to the high undercooling and the high dislocation density during rapid solidification.",

keywords = "cooling rate, dendritic growth, massive γ phase, microstructure evolution",

author = "Yi Liu and Rui Hu and Tiebang Zhang and Hongchao Kou and Jun Wang and Guang Yang and Jinshan Li",

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doi = "10.1007/s11665-015-1696-6",

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T1 - Dendritic Growth and Microstructure Evolution with Different Cooling Rates in Ti48Al2Cr2Nb Alloy

AU - Liu, Yi

AU - Hu, Rui

AU - Zhang, Tiebang

AU - Kou, Hongchao

AU - Wang, Jun

AU - Yang, Guang

AU - Li, Jinshan

PY - 2016/1/1

Y1 - 2016/1/1

N2 - The influence of cooling rates on the dendritic growth and microstructure evolution of Ti48Al2Cr2Nb alloy is studied by electromagnetic levitation combined with copper mold casting. The different cooling rates of the conical as-cast sample with diameters from 4.7 to 0.8 mm were calculated by ANSYS software. The results show that primary dendrite arm spacing decreases with increase in cooling rate. Peritectic transformation (L + β → α) and the transformation of α → (α2 + γ) are restrained at cooling rate of 2.3 × 104 K s−1. With further increase in cooling rate (2.6 × 104 K s−1), a fine and homogeneous microstructure can be observed in the conical casting sample with the diameter of 0.8 mm. It consists of a large amount of massive γ phase, lath-like γ phase, and only few lamellar structures (α2 + γ). The formation of the microstructure in the alloy is attributed to the strong chilling, giving rise to the high undercooling and the high dislocation density during rapid solidification.

AB - The influence of cooling rates on the dendritic growth and microstructure evolution of Ti48Al2Cr2Nb alloy is studied by electromagnetic levitation combined with copper mold casting. The different cooling rates of the conical as-cast sample with diameters from 4.7 to 0.8 mm were calculated by ANSYS software. The results show that primary dendrite arm spacing decreases with increase in cooling rate. Peritectic transformation (L + β → α) and the transformation of α → (α2 + γ) are restrained at cooling rate of 2.3 × 104 K s−1. With further increase in cooling rate (2.6 × 104 K s−1), a fine and homogeneous microstructure can be observed in the conical casting sample with the diameter of 0.8 mm. It consists of a large amount of massive γ phase, lath-like γ phase, and only few lamellar structures (α2 + γ). The formation of the microstructure in the alloy is attributed to the strong chilling, giving rise to the high undercooling and the high dislocation density during rapid solidification.

KW - cooling rate

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KW - massive γ phase

KW - microstructure evolution

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Dendritic Growth and Microstructure Evolution with Different Cooling Rates in Ti48Al2Cr2Nb Alloy

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