Microstructure and properties of forged plasma arc melted pilot ingot of Ti–45Al–8.5Nb–(W, B, Y) alloy

Gao, Shubo; Xu, Xiangjun; Shen, Zhengzhang; Teng, Yanguo; Xu, Shuai; Lin, Junpin

doi:10.1016/j.msea.2016.09.034

Cited by 30 publications

(6 citation statements)

References 36 publications

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“…The UTS and PE of each specimen and the corresponding mean value of each kind of specimen are shown in Table 2. For comparison, the UTSs and PEs of the as-cast and the as-forged alloys, which were previously measured with plate specimens by our group, are also shown in the table [24]. The average value of UTS for CJ and FJ specimens are 488MPa and 794 MPa, respectively.…”

Section: Resultsmentioning

confidence: 99%

Friction Weldability of a High Nb Containing TiAl Alloy

Lin

Guo

2019

Materials

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The friction weldability of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y alloy has been investigated by optimizing process parameters and analyzing the microstructures and tensile properties of the joints. The as-cast alloy with a nearly lamellar (NL) microstructure and the as-forged alloys with a duplex (DP) microstructure have been successfully welded. All the joints have a severe deformation zone (SDZ) and a transition zone (TZ) between the parent metal (PM) and SDZ. SDZ, showing a biconcave lens geometry, has a maximum thickness of hundreds of micrometers at the periphery. TZ is hundreds of micrometers thick. All SDZs have a fine-grained DP microstructure with a grain size of a few micrometers. For the joint of the as-cast alloy, the TZ consists of deformed lamellar colonies as the major constituent and partially recrystallized grains as the minor constituent. For the joint of the as-forged alloy, the TZ is similar to both the PM and SDZ, showing a DP microstructure. The grain size, volume fraction of γ grains, and the remnant lamellar colonies all increase with the distance from the SDZ. All joints presented perfect metallurgical bonding. The strengths of the joints are higher than those of the corresponding PMs. This indicates that the studied alloy has good friction weldability.

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Section: Resultsmentioning

confidence: 99%

Friction Weldability of a High Nb Containing TiAl Alloy

Lin

Guo

2019

Materials

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“…To obtain better mechanical properties, further improvement is still required to limit the impurity pick-up during the debinding and sintering processes. [24] 668 0.49~0 Wrought alloy [25] 897 2.2~0 MIM-ed Ti-45Al-5Nb-0.2B-0.2C (at %) [11] 630 0.2 <1…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…Figure 11 shows the X-ray diffraction patterns of both as-casted and as-sintered TiAl alloys after oxidation at 900 • C for 100 h. It can be seen that the oxide scales of both alloys are dominated by TiO 2 , besides a minor amount of α-Al 2 O 3 , and a small amount of TiN is observed only in the as-sintered alloy. [24] 668 0.49 ~0 Wrought alloy [25] 897 2.2 ~0 MIM-ed Ti-45Al-5Nb-0.2B-0.2C (at %) [11] 630 0.2 <1…”

Section: Oxidation Behaviourmentioning

confidence: 99%

Metal Injection Moulding of High Nb-Containing TiAl Alloy and Its Oxidation Behaviour at 900 °C

Liu

Yang

et al. 2018

Metals

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High Nb-containing TiAl alloy with a nominal composition of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (at %) was fabricated by metal injection moulding (MIM) technology with an improved wax-based binder. The critical powder loading and feedstock rheological behaviour were determined. The influence of sintering temperature on microstructures and mechanical properties of the sintered samples and their oxidation behaviour were also investigated. Results showed that a feedstock, with a powder loading of 68 vol % and good flowability, could be obtained by using the improved binder, and oxygen pickup was lower than that of the sample prepared by using a traditional binder. The ultimate tensile strength (UTS) and plastic elongation of the sample sintered at 1480 • C for 2 h were 412 MPa and 0.33%, at room temperature, respectively. The 1480 • C-sintered sample consisted of γ/α 2 lamellar microstructure with the average colony size of about 70 µm, and its porosity was about 4%. The sintered alloy showed better oxidation resistance than that of the cast alloy counterpart.

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“…The representative TiAl alloys, Ti-48Al-2Nb-2Cr alloy and Ti-43.5Al-4Nb-1Mo-0.1B alloy (all compositions in this paper are given in atomic percentage), were used in many aero-engines [3,4]. The Nb element increases oxidation resistance, melting point, and high temperature strength of TiAl alloys, thus high Nb containing TiAl alloys are expected to be used at higher service temperatures [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Element Distribution and Its Induced Peritectic Reaction during Solidification of Ti-Al-Nb Alloys

Lin

Xiang

et al. 2021

Metals

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The element distribution and the microstructures of directionally solidified ingots of Ti-45Al-8Nb and Ti-46Al-8Nb alloys were studied by scanning electron microscope (SEM) and electron probe microanalyzer (EPMA) equipped with wavelength-dispersive X-ray spectroscope (WDS). At high solidification rates, e.g., more than 50 μm/s, the ingot solidified in columnar β dendrites, while at low solidification rates, e.g., less than 30 μm/s, the solidification path changed from initial β solidification to L + β→α peritectic solidification, forming cellular dendrites with the β phase matrix surrounded by the α phase. The difference of Ti content in dendritic arms and interdendritic regions was not pronounced. The composition segregation was mainly caused by the mutual conversion of Al and Nb contents. Therefore, it was difficult to distinguish the variation of Ti in microstructure by EPMA-WDS map and line profiles. The composition of the peritectic α phase was different from that of the α phase transformed directly from the β phase. The Al content of the former was about 1 at% higher than that of the latter, while the Nb content was about 1 at% lower. The change of solidification path in the final solidified part resulted from the more severe segregation caused by slow solidification.

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Microstructure and properties of forged plasma arc melted pilot ingot of Ti–45Al–8.5Nb–(W, B, Y) alloy

Cited by 30 publications

References 36 publications

Friction Weldability of a High Nb Containing TiAl Alloy

Friction Weldability of a High Nb Containing TiAl Alloy

Metal Injection Moulding of High Nb-Containing TiAl Alloy and Its Oxidation Behaviour at 900 °C

Element Distribution and Its Induced Peritectic Reaction during Solidification of Ti-Al-Nb Alloys

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