Results 261 to 270 of about 11,738 (294)

Recent research and development of mould materials for casting TiAl alloys

Materials Science and Technology, 2019
Intermetallic TiAl alloys are new generation high-temperature material. However, extensive application of TiAl alloys is hindered by some disadvantages, especially the high processing cost. Currently, precision casting is an effective method to manufacture TiAl components with complex shape.
Jianglei Fan, Liubo Liang, Zhanyun Liu, Yuwen Li, Ying Li, Hongxia Gao, Shen Wu, Yan Wang, Xiao Wang   +8 more
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Efect of Cyclic Heat Treatment on Cast Structure of TiAl Alloy

Key Engineering Materials, 2013
The subject of the article is focused on the refining of the cast structure of gamma TiAl–2Nb alloy using cyclic heat treatment and on the analysis of the grain refining mechanism. Microstructure evolution after applied cycles of heat treatment was characterized using light, laser and electron microscopy and using microhardness tests.
Martin Petrenec, Eva Vraspírová, Karel Němec, Milan Heczko   +3 more
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Tensile Properties of a Cast TiAl Alloy with Directional Lamellar Microstructures

Advanced Materials Research, 2013
A cast TiAl alloy with directional γ-TiAl/α2-Ti3Al lamellar microstructure showed excellent strength retention at high temperatures and distinguished ambient ductility level as well. But both the ductility and strength at room temperature exhibited somewhat undulation.
Sheng Li, Chun Lei Zhu, Rui Cao, Ji Zhang   +3 more
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Effect of TiB2 addition on microstructure and fluidity of cast TiAl alloy

Vacuum, 2020
Abstract Effects of TiB2 addition on Microstructure and Fluidity of Ti–48Al–2Cr–2Nb + xTiB2 (x = 0.18, 0.36, 0.54, 0.72, 0.9, 1.8 wt%) alloys fabricated by vacuum non-consumable tungsten arc melting were investigated. Results showed that with adequate TiB2 addition (0.72% TiB2 and more), the as-cast microstructure transformed from coarse columnar ...
Jianchao Han, Zhidong Liu, Yi Jia, Tao Wang, Liping Zhao, Jibao Guo, Shulong Xiao, Yuyong Chen   +7 more
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The Study on TiAl Based Alloy Blade Casting Structure by Bottom Pouring Vacuum Suction Casting

Applied Mechanics and Materials, 2013
In this paper, the bottom pouring vacuum suction casting is used, and the TiAl-based alloy blade with good face quality was obtained. Bottom pouring vacuum suction casting obtained Ti-47Al-5Nb-0.5Si alloy fine structure, the average grain size is 20um or less. Metal permanent forced cooling effect increases the undercooling degree, and the formation of
Xi Cong Ye, Wei Guang Zhao
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Dynamic recrystallization behavior of an as-cast TiAl alloy during hot compression

Materials Characterization, 2014
Abstract High temperature compressive deformation behaviors of as-cast Ti–43Al–4Nb–1.4W–0.6B alloy were investigated at temperatures ranging from 1050 °C to 1200 °C, and strain rates from 0.001 s − 1 to 1 s − 1 . Electron back scattered diffraction technique, scanning electron microscopy and transmission electron microscopy were employed to ...
Jianbo Li, Yong Liu, Yan Wang, Bin Liu, Yuehui He   +4 more
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Creep behaviour of a cast TiAl-based alloy for industrial applications

Intermetallics, 2006
Abstract The creep behaviour of a cast TiAl-based alloy with nominal chemical composition Ti–46Al–2W–0.5Si (at.%) was investigated. Constant load tensile creep tests were performed in the temperature range 973–1073 K and at applied stresses ranging from 200 to 390 MPa.
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As-cast microstructure characteristics dependent on solidification mode in TiAl-Nb alloys

Journal of Alloys and Compounds, 2019
Abstract In this work, as-cast microstructure characteristics are identified for the TiAl–Nb alloys with four typical solidification modes, namely, single β (B mode), hypo-peritectic (BA mode), hyper-peritectic (BAA mode) and single α (A mode) solidification. B mode alloys are chemically more homogeneous, and they show netty white ridge β-segregation
Xianfei Ding, Liwei Zhang, Jianping He, Fuqiang Zhang, Xin Feng, Hai Nan, Junpin Lin, Young-Won Kim   +7 more
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Grain refinement by trace TiB2 addition in conventional cast TiAl-based alloy

Materials Characterization, 2015
Abstract Effects of trace TiB2 addition on the solidification microstructure of Ti–48Al–2Cr–2Nb + (0.18, 0.54, 0.9) wt.% TiB2 alloys were investigated by arc melting and electromagnetic levitation melting in this paper. Results showed that the matrix alloy generated a large-grained (~ 800 μm) fully lamellar microstructure, and the grain size ...
Jianchao Han, Shulong Xiao, Jing Tian, Yuyong Chen, Lijuan Xu, Xiaopeng Wang, Yi Jia, Zhaoxin Du, Shouzhen Cao   +8 more
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TEM investigation on the interfacial boundaries in as-cast Ti3Al+TiAl alloy

Acta Metallurgica et Materialia, 1991
Abstract Ti3Al/TiAl interfaces and TiAl/TiAlT thermal twin boundaries were investigated by transmission electron microscopy in a Ti-42 at.%Al as-cast and homogenized alloy. Intrinsic and extrinsic interfacial dislocations (IIDs and EIDs respectively) have been found on the Ti3Al/TiAl interfaces.
L. Zhao, K. Tangri
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