Experimental phase diagram study of the TiAl-rich part of the Ti–Al–Ni ternary system

Nakashima, Hideharu; Yu, Jie; Takeyama, Masao

doi:10.1016/j.calphad.2022.102521

Cited by 4 publications

(2 citation statements)

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“…The morphological appearance of these structures suggests that they could have formed via a martensitic transformation, which would be in agreement with available literature. [ 31,35,36 ] In case of the α phase, clearly contrasted features are visible in Figure 3 and in the enlarged inset 2 (labeled with α 1 and α 2 ). The prevalent contrast in BSE mode suggests locally varying chemical compositions.…”

Section: Resultsmentioning

confidence: 97%

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Insights into Phase Evolution and Mechanical Behavior of the Eutectoid Ti–6.4(wt%)Ni Alloy Modified with Fe and Cr

Pfaffinger,

Staufer,

Edtmaier

et al. 2023

Adv Eng Mater

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Titanium alloys gain increasing importance in industry due to the expansion of advanced manufacturing technologies such as additive manufacturing. Conventional titanium alloys processed by such technologies suffer from formation of large primary grains and anisotropy of mechanical properties. Therefore, novel alloys are required. Herein, the effect of ternary alloying elements Fe and Cr on the Ti–6.4(wt%)Ni eutectoid system is investigated. Both elements act as eutectoid formers. Fe and Cr show sluggish transformation behavior, whereas Ni is an active eutectoid‐forming element. Thereby, sluggish refers to slow and active to fast transformation kinetics. The focus of this work is on the combined addition of such elements studied under different heat‐treatment conditions. It is shown in the results that largely varying microstructures can be generated resulting in hardness values ranging from 239 to 556 HV0.1. Moreover, the formation of a substructure within the α phase of direct aged alloys is observed. The formation mechanism of this substructure is investigated in detail. The mechanical properties are discussed based on the microstructural characteristics. The presence of intermetallic Ti2Ni phase increases the Young's modulus, whereas the presence of ω phase results in embrittlement. The results shed light upon the complex phase formation and decomposition behavior of titanium alloys based on Ti–6.4Ni.

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Section: Resultsmentioning

confidence: 97%

“…Extremely fine substructures present within the β phase of all three alloys correspond to lath‐like α phase, likely forming via a martensitic transformation. [ 31,35,36 ] The α phase of all alloys in the direct aged material conditions evidences the presence of a substructure. Both will be treated in Subsection 2.3.…”

Section: Resultsmentioning

confidence: 99%