Book ChapterDOI
Grain Refinement Mechanism of Aluminum by Al-Ti-B Master Alloys
Xiaoming Wang,Qingyou Han +1 more
- pp 189-193
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TLDR
In this article, a dynamic nucleation theory for the grain refinement is proposed as a dynamic Al3Ti layer in the thickness of a couple of atoms existing on the surface of (Ti,Al)B2 and being responsible for nucleating aluminum grains.Abstract:
Al-Ti-B type master alloys are routinely added into aluminum for a grain refinement purpose. However, a consensus about the mechanism of grain refinement is still yet to reach. This work is aiming at further understanding the grain refinement mechanism through studying the stability of TiB2 in pure aluminum and TiB2/Al3Ti interfaces in aluminum by transmission electron microscopic (TEM) techniques. It is found that TiB2 reacts with aluminum forming (Ti,Al)B2 solid solution and releasing titanium into aluminum. A crystallographic orientation relationship exists between TiB2 and Al3Ti in Al-Ti-B alloys. A dynamic nucleation theory for the grain refinement is therefore proposed as a dynamic Al3Ti layer in the thickness of a couple of atoms existing on the surface of (Ti,Al)B2 and being responsible for nucleating aluminum grains.read more
Citations
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Journal ArticleDOI
Analysis of energy-force parameters of combined processing for receiving modifying bars from Al – 5 Ti – 1 B alloy
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Mixing process and nucleation of an Al-Si alloy during controlled diffusion solidification with simultaneous mixing and effect of mixing rate
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Assessment of Melt Cleanliness of Secondary 5000 Aluminum Alloy Via Non-metallic Inclusions Characterization
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Morphological Evolution of TiB2 and TiAl3 in Al–Ti–B Master Alloy Using Different Ti Adding Routes
TL;DR: In this paper , three different Ti addition routes were used to prepare an Al-5Ti-B Master Alloy: the halide salt route, the Ti-sponge route, and the partial Ti sponge route.
References
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Journal ArticleDOI
Modelling of inoculation of metallic melts : Application to grain refinement of aluminium by Al-Ti-B
TL;DR: In this article, a numerical model is presented for the prediction of grain size in inoculated castings and is tested against measured grain sizes obtained in standard grain-refiner tests on aluminium alloys.
Journal ArticleDOI
Grain refinement of aluminium and its alloys by heterogeneous nucleation and alloying
TL;DR: A review of the literature on grain refinement by heterogeneous nucleation and alloying can be found in this paper, where the types of grain refiner, Al-Ti-B master alloys in particular, and their methods of manufacture are discussed.
Journal ArticleDOI
Grain refining of aluminium and its alloys using inoculants
TL;DR: Grain structure is an important and readily observable feature in cast aluminium alloys as mentioned in this paper, and three types of grain morphology are possible, namely, columnar, twinned columnar and equiaxed.
Journal ArticleDOI
Mechanism of grain refinement in aluminium
P.S. Mohanty,J.E. Gruzleski +1 more
TL;DR: In this article, the commercial grain refining practice of aluminium has been experimentally simulated by introducing synthetic TiB2 crystallites into melts by a specially developed technique, and experimental findings indicate that TiB 2 crystallites alone do not nucleate α-Al.
Journal ArticleDOI
Grain Refining Mechanism in the Al/Al-Ti-B System
Zhongyun Fan,Yun Wang,Yijie Zhang,T. Qin,Xiaorong Zhou,George Thompson,Timothy J. Pennycook,Teruo Hashimoto +7 more
TL;DR: In this paper, a high-resolution electron microscopy investigation has confirmed the existence of a Ti-rich monolayer on the surface of the (0.0, 0.1) TiB2 surface, which is most likely to be a (1 − 1 2 ) Al3Ti 2DC.