Additive Manufacturing of Ti-48Al-2Cr-2Nb Alloy Using Gas Atomized and Mechanically Alloyed Plasma Spheroidized Powders

Polozov, Igor; Kantyukov, Artem; Goncharov, Ivan; Razumov, Nikolay; Silin, A. O.; Popovich, Vera; Zhu, Jia–Ning; Popovich, Anatoly

doi:10.3390/ma13183952

Cited by 20 publications

(12 citation statements)

References 52 publications

(63 reference statements)

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“…Figure 8f shows a comparison of the UCS as a function of CS for several γ‐TiAl‐based alloys via different processing techniques. [ 24–37 ] As can be seen from the graph, our results (UCS ≈ 2134 MPa and CS ≈ 28.7%) show a superior combination of strength and ductility, suggesting that the formation of high‐ordered nanotwins can be an effective way to fabricate high‐performance γ‐TiAl‐based alloys in the aerospace industry.…”

Section: Resultsmentioning

confidence: 74%

Peritectic Solidification Kinetics and Mechanical Property Enhancement in a Rapidly Solidified Ti–48 at% Al–8 at% Nb Alloy via Hierarchical Twin Microstructure

Liang

Wang

2021

Adv Eng Mater

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The strength and ductility trade‐off dilemma has limited the wide application of TiAl‐based alloys. Here, a new insight into the potential for increasing the strength and ductility of a hypoperitectic Ti–48 at% Al–8 at% Nb alloy is accomplished by the electromagnetic levitation (EML) technique. Moreover, a systematic analysis of the primary and subsequent peritectic solidification kinetics is conducted in the undercooling range of 308 K. Assisted by a high‐speed camera, in situ observation of the liquid–solid (primary β‐Ti phase and peritectic α‐Ti phase) interface migration is accomplished. When the alloy melt is undercooled to 240 K, high‐ordered nanotwins are observed in the Ti–48 at% Al–8 at% Nb alloy, which form a unique hierarchical microstructure. Upon further increasing the undercooling, the density of these nanotwins is significantly enhanced. The room‐temperature compression results reveal that the strength and ductility increase up to 140% and 150%, respectively. This is mainly ascribed to the remarkable grain refinement, formation of nanotwins with various orientations, accumulation of dislocations and stacking faults, and retention of the metastable γ‐phase. The superior combination of strength and ductility indicates the possibility to fabricate high‐ordered nanotwins via rapid solidification, thus improving the performance of γ‐TiAl‐based alloys.

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Section: Resultsmentioning

confidence: 74%

Peritectic Solidification Kinetics and Mechanical Property Enhancement in a Rapidly Solidified Ti–48 at% Al–8 at% Nb Alloy via Hierarchical Twin Microstructure

Liang

Wang

2021

Adv Eng Mater

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“…The high rate of heating and cooling (10 4 -10 6 K/s) [62] during the LPBF manufacturing process, which results in the build-up of residual stress, was responsible for the inability to produce crack-free TiAl near-net components [28,37]. A host of researchers tried to determine the optimum process parameters that could be used to produce crack-free TiAl near-net-shapes, but to no avail [54,[59][60][61]63]. These attempts were based on the premise that there are more than 50 processing parameters [64] that influence melt pool geometry during the LPBF process and the appropriate combinations of these parameters might help to overcome the cracking effect.…”

Section: Laser Powder Bed Fusion Of Tial-based Alloysmentioning

confidence: 99%

Additive Manufacturing of Ti-Based Intermetallic Alloys: A Review and Conceptualization of a Next-Generation Machine

Dzogbewu

Preez

2021

Materials

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TiAl-based intermetallic alloys have come to the fore as the preferred alloys for high-temperature applications. Conventional methods (casting, forging, sheet forming, extrusion, etc.) have been applied to produce TiAl intermetallic alloys. However, the inherent limitations of conventional methods do not permit the production of the TiAl alloys with intricate geometries. Additive manufacturing technologies such as electron beam melting (EBM) and laser powder bed fusion (LPBF), were used to produce TiAl alloys with complex geometries. EBM technology can produce crack-free TiAl components but lacks geometrical accuracy. LPBF technology has great geometrical precision that could be used to produce TiAl alloys with tailored complex geometries, but cannot produce crack-free TiAl components. To satisfy the current industrial requirement of producing crack-free TiAl alloys with tailored geometries, the paper proposes a new heating model for the LPBF manufacturing process. The model could maintain even temperature between the solidified and subsequent layers, reducing temperature gradients (residual stress), which could eliminate crack formation. The new conceptualized model also opens a window for in situ heat treatment of the built samples to obtain the desired TiAl (γ-phase) and Ti3Al (α2-phase) intermetallic phases for high-temperature operations. In situ heat treatment would also improve the homogeneity of the microstructure of LPBF manufactured samples.

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“…One of the universal methods to produce spherical powders of various compositions, including refractory ones [19][20][21] and with defined particle distribution, is plasma spheroidization [15,[22][23][24]. The feedstock material for this process is a powder of any irregular shape.…”

Section: Introductionmentioning

confidence: 99%

Structure Evolution of Ni36Al27Co37 Alloy in the Process of Mechanical Alloying and Plasma Spheroidization

Мазеева

Kim

Ozerskoi

et al. 2021

Metals

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In this paper, a novel approach to obtain a ferromagnetic material for smart applications was implied. A combination of mechanical alloying (MA) and plasma spheroidization (PS) was applied to produce Ni36Al27Co37 spherical powder. Then its structure was systematically studied. It was shown that homogenization of the structure occurs due to mechanism of layered structure formation. The dependence of the lamella thickness on the energy dose input at MA was defined. It was found that 14.7 W⋅h/g is sufficient to obtain lamella thickness of 1 μm and less. The low-energy mode of a planetary mill with rotation speeds of the main disk/bowl of 150/−300 rpm makes it possible to achieve a uniform element distribution upon a minimal amount of impurity. During MA in an attritor Ni3Al-type intermetallic compounds are formed that result in more intensive degradation in particle size. Plasma spheroidization of the powder after MA allowed obtaining Ni36Al27Co37 spherical powder. The powder had a fine β + γ-structure. The particle size distribution remains almost unchanged compared to the MA stage. Coercivity of the powder is 79 Oe. The powder obtained meets the requirements of selective laser melting technology, but also can be utilized as a functional filler in various magnetic composites.

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Additive Manufacturing of Ti-48Al-2Cr-2Nb Alloy Using Gas Atomized and Mechanically Alloyed Plasma Spheroidized Powders

Cited by 20 publications

References 52 publications

Peritectic Solidification Kinetics and Mechanical Property Enhancement in a Rapidly Solidified Ti–48 at% Al–8 at% Nb Alloy via Hierarchical Twin Microstructure

Peritectic Solidification Kinetics and Mechanical Property Enhancement in a Rapidly Solidified Ti–48 at% Al–8 at% Nb Alloy via Hierarchical Twin Microstructure

Additive Manufacturing of Ti-Based Intermetallic Alloys: A Review and Conceptualization of a Next-Generation Machine

Structure Evolution of Ni36Al27Co37 Alloy in the Process of Mechanical Alloying and Plasma Spheroidization

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