Journal ArticleDOI
Microstructure evolution and tensile properties of conventional cast TiAl-based alloy with trace Ni addition
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TLDR
The microstructure evolution and tensile properties of Ti-48Al-2Cr-2Nb-0.25Ni alloy fabricated by the induction skull melting (ISM) process were investigated in this paper.Abstract:
The microstructure evolution and tensile properties of Ti-48Al-2Cr-2Nb-0.25Ni alloy fabricated by the induction skull melting (ISM) process were investigated. Results showed that the influence of trace Ni addition on the cast microstructure was slight, while the γ phase fraction increased relatively. After tensile tests at elevated temperature, nanoscale τ3 particles precipitated within the lamellar colony in the gauge area. The τ3 phase exhibited the specific orientation relationship with the α2 and γ phases: ( 22 4 2 ) τ 3 // ( 40 4 1 ) α 2 // ( 113 ) γ and [ 1 1 00 ] τ 3 //[11 2 0] α 2 //[ 1 10]γ . At elevated temperature, the UTS and ef were enhanced evidently by Ni addition than that of Ti-48Al-2Cr-2Nb alloy. Dislocations were pinned by the nanoscale τ3 precipitates during tensile deformation at elevated temperature. The nanoscale τ3 precipitates and increased γ phase fraction induced by Ni alloying could account for the notable tensile properties in the present work. The precipitation behavior and the main strengthening mechanism were analyzed and discussed in detail.read more
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Research on aluminum component change and phase transformation of TiAl-based alloy in electron beam selective melting process under multiple scan
Jun Zhou,Jun Zhou,Hongxin Li,Hongxin Li,Yefeng Yu,Yefeng Yu,Yang Li,Yang Li,Ya Qian,Ya Qian,Kevin F. Firouzian,Kevin F. Firouzian,Feng Lin,Feng Lin +13 more
TL;DR: In this article, a multiple low energy scan coupled with multi-region scan strategy is utilized to enhance the element evaporation without causing the curly surface in scan area, which could damage the powder spread rake and deposition quality of subsequent layers.
Journal ArticleDOI
Microstructure evolution and mechanical properties of TiAl binary alloys added with SiC fibers
Yingmei Tan,Ruirun Chen,Hongze Fang,Yangli Liu,Hongsheng Ding,Yanqing Su,Jingjie Guo,Hengzhi Fu +7 more
TL;DR: In this paper, the microstructure, phase transformation, mechanical properties and related mechanism of binary alloys with different SiC fibers contents were elaborately researched, and a good combination of strength and ductility of SiC-containing Ti33.3Al alloy was obtained, the highest values of them were 2196
Journal ArticleDOI
Peculiar microstructural evolution and tensile properties of β-containing γ-TiAl alloys fabricated by electron beam melting
Ken Cho,Hajime Kawabata,Tatsuhiro Hayashi,Hiroyuki Y. Yasuda,Hirotoyo Nakashima,Masao Takeyama,Takayoshi Nakano +6 more
TL;DR: In this paper, the microstructure and tensile properties of β-containing Ti-44Al-4Cr alloy rods additively manufactured by electron beam melting (EBM) process were examined as a function of input energy density determined by the processing parameters.
Journal ArticleDOI
Microstructure and phase evolution in γ-TiAl/Ti2AlNb dual alloy fabricated by direct metal deposition
TL;DR: In this paper, the formation mechanism of the transition zone was analyzed after considering solidification route and compositional variations, and it was shown that a transition zone mainly consists of three layers, and compositions are comparatively uniform in layers but change stepwise between each other.
Journal ArticleDOI
A Review of Microstructure Control and Mechanical Performance Optimization of γ-TiAl Alloys
Runrun Xu,Miao Li,Yong-Hong Zhao +2 more
TL;DR: In this paper , a review paper summarizes factors influencing mechanical properties of γ-TiAl alloys during compression, tension, creep and fatigue as well as tribology tests, including fracture mechanisms.
References
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Rietveld refinement guidelines
TL;DR: A set of general guidelines for structure refinement using the Rietveld (whole profile) method has been formulated by the International Union of Crystallography Commission on Powder Diffraction.
Journal ArticleDOI
Design, Processing, Microstructure, Properties, and Applications of Advanced Intermetallic TiAl Alloys†
Helmut Clemens,Svea Mayer +1 more
TL;DR: In this article, a general survey of engineering γ-TiAl based alloys is given, but concentrates on β-solidifying alloys which show excellent hot-workability and balanced mechanical properties when subjected to adapted heat treatments.
Journal ArticleDOI
Progress in the understanding of gamma titanium aluminides
Young-Won Kim,Dennis M. Dimiduk +1 more
TL;DR: In this article, the authors present a review of the current understanding of the above specific aspects and the processing-microstructure-property relationships, and identify pacing problems and applications, as well as identify pacing issues and applications.
Journal ArticleDOI
Diffusion in the Ti–Al system
Yuri Mishin,Chr. Herzig +1 more
TL;DR: In this article, a statistical model of point defect disorder in ordered compounds is presented and applied to Ti3Al and TiAl using input data generated with embedded-atom potentials.
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