Size dependent phase transformation in atomized TiAl powders

Yang, Dongsheng; Guo, Shu; Peng, Hua-Xin; Cao, Fuyang; Liu, Na; Sun, Jianfei

doi:10.1016/j.intermet.2015.02.017

Cited by 30 publications

(14 citation statements)

References 29 publications

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“…2b). Similar features have been found by Yang et al [18] in Ti-48 at.-%. The estimated phase fractions by XRD of the powder are supersaturated a 2 and 10% b/B2 (Fig.…”

Section: Characterisation Of Tial Powdersupporting

confidence: 90%

“…2c). However, it is important to note that the phase fractions significantly differ with the grain size due to dissimilar thermal histories (cooling rates, undercooling [18]). Concerning the influence of the alloy composition Hu et al [19] demonstrated that at very high cooling rates supersaturated a 2 can be expected in Tie46Ale8Nb, whereas in the case of Tie44Ale4Nbe4Zre0.2Sie0.3B besides a 2 also retained b/B2 was found [20].…”

Section: Characterisation Of Tial Powdermentioning

confidence: 99%

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Microstructure of γ-titanium aluminide processed by selective laser melting at elevated temperatures

et al. 2015

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“…2b). Similar features have been found by Yang et al [18] in Ti-48 at.-%. The estimated phase fractions by XRD of the powder are supersaturated a 2 and 10% b/B2 (Fig.…”

Section: Characterisation Of Tial Powdersupporting

confidence: 90%

Section: Characterisation Of Tial Powdermentioning

confidence: 99%

Microstructure of γ-titanium aluminide processed by selective laser melting at elevated temperatures

et al. 2015

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“…The equiaxed dendrite morphology can be clearly seen, which is consistent with its surface morphology. This size-dependent change in surface morphology could also be attributed to the different thermal gradient in the solidification process of the powders with different sizes [17,20]. According to the classical solidification theory, under sufficient high thermal gradient (in the case of the fine powder), the solidification with a plane front can be obtained, resulting in the smooth and featureless surface [21].…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, in order to optimize the fabrication process parameters of a TiAl-based alloy, it is critical to uncover the size-dependent structural properties of TiAl-based alloy powders. In the previous reports, the structural properties of some TiAl binary alloy powders and one low-Nb TiAl alloy powder have been studied [15][16][17]. The phase structure was found to be greatly size-dependent.…”

Section: Introductionmentioning

confidence: 99%

Size-Dependent Structural Properties of a High-Nb TiAl Alloy Powder

Liu

Wang

et al. 2020

Materials

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TiAl-based alloys are promising light weight structural materials for high temperature applications in the field of aerospace. Recently, fabrication technologies starting from powders including powder metallurgy and additive manufacturing have been developed to overcome the difficulties in the processing, machining and shaping of TiAl-based alloys. Spherical alloy powders with different particle size distributions are usually used in these fabrication techniques. The purpose of this study is to reveal the size-dependent structural properties of a high-Nb TiAl powder for these fabrication technologies starting from powders. A high-Nb TiAl pre-alloyed powder with nominal composition of Ti-48Al-2Cr-8Nb (at. %) was prepared by the electrode induction melting gas atomization (EIGA) method. The phase structure and morphology of the as-atomized powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The size-dependent structural changes of the as-atomized powders with different sizes were studied by differential scanning calorimetry (DSC) and in situ high temperature XRD. It was found that with decreasing the powder size, the content of the γ-TiAl phase decreases and the α2-Ti3Al phase increases. The α2-Ti3Al to γ-TiAl phase transformation was found in the temperature range of 600–770 °C. Based on the present work, the structural characteristics of TiAl powders are strongly dependent on their particle size, which should be considered in optimizing the process parameters of TiAl alloys fabricated from powders.

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“…It has significant advantages such as good wettability and clean interface between the reinforcement and Al matrix [4]. Therefore, in-situ Al 3 Ti/Al alloy has received extensive attentions, and several methods have been developed, such as in-situ casting [5], powder metallurgy [6], friction stir processing [7] and mechanical alloying [8].…”

Section: Introductionmentioning

confidence: 99%