NDLI: Growth rate and composition of directionally solidified intermetallic TiAl–Nb alloys with different solidification conditions

Content Provider	Springer Nature Link
Author	Zhang, Li Wei Lin, Jun Pin Xu, Xiang Jun He, Jian Ping Ding, Xian Fei Jin, Xiao Ou
Copyright Year	2015
Abstract	Intermetallic Ti–xAl–8Nb (x = 41, 43, 45, 47, 49; at%) alloys were solidified unidirectionally upwards with a constant temperature gradient of G = 3.8 K·mm$^{−1}$ at wide range of growth rates of v = 10–400 μm·s$^{−1}$ using a Bridgman directional solidification (DS) furnace. Microstructural parameters including the primary dendrite arm spacing (λ $_{1}$), secondary dendrite arm spacing (λ $_{2}$), dendrite tip radius (R) and mushy zone depth (d) were measured statistically. The values of λ $_{1}$, λ $_{2}$, R and d decrease as the growth rate increases for a given composition (x). The values of λ $_{1}$, λ $_{2}$, R and v increase with the increase in x value, while the value of d firstly increases and then decreases with the increase in x value for a given v. The relationships between λ $_{1}$, λ $_{2}$ and R were analyzed by the linear regression. The average growth rate exponent of λ $_{1}$ is 0.29, which is in accordance with the previous experimental observations, and that of λ $_{2}$ is close to the previous experimental results, while those of R and d are lower than the results in other alloy systems. In addition, theoretical models for λ $_{1}$, λ $_{2}$ and R were compared with the experimental observations, and a comparison of the present experimental results with the theoretical models and previous experimental results was also made.
Starting Page	54
Ending Page	64
Page Count	11
File Format	PDF
ISSN	10010521
Journal	Rare Metals
Volume Number	35
Issue Number	1
e-ISSN	18677185
Language	English
Publisher	Nonferrous Metals Society of China
Publisher Date	2015-10-27
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	TiAl–Nb alloys Intermetallic Directional solidification Microstructural parameters Solute concentration Metallic Materials Nanotechnology Ceramics, Glass, Composites, Natural Methods Surfaces and Interfaces, Thin Films Inorganic Chemistry Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Physical and Theoretical Chemistry Condensed Matter Physics

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