Formation of intermediate phases and their influences on the microstructure of high strength near-β titanium alloy

Song, Bo; Chen, Yu; Xiao, Wenlong; Zhou, Lian; Ma, Chao

doi:10.1016/j.msea.2020.139886

Cited by 23 publications

(6 citation statements)

References 35 publications

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“…Hardness should be high enough to avoid shear failure during biomedical or refractory performance 31 , 32 . Figure 5 a, b presents hardness values of as-cast and quenched samples, respectively, which resulted in almost similar trends.…”

Section: Resultsmentioning

confidence: 99%

“…Tensile properties such as ultimate tensile, elastic modulus were recorded. The elastic modulus or stiffness should be as close as possible to that of the human bone to avoid stress shielding effect in orthopedic implants 31 , 32 . TMF0 alloy depicted an elastic modulus of 79 GPa in the as-cast condition while the elastic modulus upon quenching was measured to be 66 GPa.…”

Section: Resultsmentioning

confidence: 99%

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Influence of intermetallic phase (TiFe) on the microstructural evolution and mechanical properties of as-cast and quenched Ti–Mo–Fe alloys

Moshokoa,

Makhatha,

Raganya

et al. 2024

Sci Rep

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This study presents the phase analysis, microstructural characteristics, and mechanical property evaluation of the as-cast and quenched Ti–15Mo–xFe alloys with high iron content ranging from 4 to 12 weight percent. All the four alloys were produced in a vacuum-arc melting furnace. Heat treatment in the form of solution treatment was performed in a muffle furnace at a temperature of 1100 °C, with 1-h holding time and the samples were rapidly quenched in ice-brine. X-ray diffractometer (XRD) was used to analyses the phases present in each alloy whereas the optical microscope (OM) was employed to track the microstructural evolution and percentage porosity. The mechanical properties of the alloys were evaluated using a tensile test and compression test method while the micro-Vickers hardness measurements were conducted to evaluate hardness of the alloys. The XRD patterns of as-cast showed peaks belonging to the β and α″ phases and intermetallic B2 TiFe phases. The as quenched XRD peaks illustrated β phase only and Fe·Ti·O2 phases. The as-cast OM micrographs revealed equiaxed β grains, substructures, dendritic structure, and pores forming around the grain boundaries. The quenched OM showed only β equiaxed grains with pores throughout the grain boundaries. The tensile properties such as ultimate tensile strength (UTS) and elastic modulus (E) of as-cast TMF0 were 264 MPa and 79 GPa respectively and these properties changed upon quenching to 411 MPa and 66 GPa respectively. The elastic modulus of TMF1 in as-cast condition was 74 GPa. The UTS and E of TMF1, TMF2, and TMF3 in as-cast and quenched conditions were not recorded due to the fragility of the samples that failed prior to yielding any useful data. The compressive strength in as-cast and in quenched condition decreased with an increase in Fe content. The micro-Vickers hardness in as-cast and quenched conditions showed a similar trend with hardness increasing slightly upon quenching for TMF0, TMF1, and TMF3 alloys but slightly decreased in the case of TMF2. The fracture surfaces of all the as-cast and quenched alloys were comprised of ductile and brittle fracture.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Influence of intermetallic phase (TiFe) on the microstructural evolution and mechanical properties of as-cast and quenched Ti–Mo–Fe alloys

Moshokoa,

Makhatha,

Raganya

et al. 2024

Sci Rep

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“…Çalışma sonucunda düşük ısıtma hızıyla yaşlandırma işlemi uygulanan numunede αTS fazı oluşumunun baskılandığı görülmüştür. Diğer bir çalışmada ise Ti-5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe alaşımına farklı ısıtma hızlarında (10°C/dk-100°C/dk) yaşlandırma işlemi uygulanarak ısıtma hızının alaşımın mikro yapısına etkisi değerlendirilmiştir [8]. O', ωiso ve O" metasabil fazlarının oluşumunun ısıtma hızından etkilendiği gözlemlenmiştir.…”

Section: Introductionunclassified

Python Tabanlı Destek Vektörü Regresyon Modeli Kullanılarak Farklı Isıtma Hızlarında Yaşlandırılmış β Titanyum Alaşımının Sürtünme Katsayılarının Değerlendirilmesi

Yumak

2022

Süleyman Demirel Üniversitesi Fen Edebiyat Fakültesi Fen Dergisi

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Öz: Bu çalışmada, Ti-15V-3Al-3Sn-3Cr metastabil β titanyum alaşımının mikro yapısal ve aşınma özelliklerine yaşlandırma sıcaklığına ısıtma hızının etkisi incelenmiştir. Alaşım yaşlandırma sıcaklığına 0,4°C/dk, 4°C/dk, 25°C/dk ve 50°C/dk olmak üzere dört farklı hızda ısıtılmıştır. Isıl işlemler sonrasında alaşımın mikro yapısal özellikleri Taramalı Elektron Mikroskobu (SEM) analiziyle incelenmiştir. Alaşımın mekanik özellikleri ise mikro sertlik ve aşınma testleri uygulanarak belirlenmiştir. En küçük boyda α fazları (393±43nm) 0,4°C/dk hızla yaşlandırma sıcaklığına ısıtılmış numunede elde edilmiştir. Isıtma hızının artmasıyla birlikte ise α fazları büyümüş ve böylece en yüksek mikro sertlik 0,4°C/dk hızla ısıtılan numunede, en düşük mikro sertlik ise 50°C/dk hızla ısıtılan numunede elde edilmiştir. Aşınma testleri 3N ve 10N olmak üzere iki farklı yükte ve 150 metre ve 400 metre olmak üzere iki farklı kayma mesafesinde uygulanmıştır. Aşınma testi sonrası kütle kaybı yük ve kayma mesafesinin artmasıyla birlikte tüm numune gruplarında artmıştır. Aşınma testleri sonrasında elde edilen verilere, istatistiki veri analizi uygulanarak sürtünme katsayıları tayin edilmiştir. Ayrıca aşınma testinde elde edilen sürtünme katsayısı verileri, %40 test ve %60 eğitim olmak üzere iki sete bölünmüştür. Model performansı, ortalama hata karesi, ortalama karekök sapması ve regresyon değeri dikkate alınarak değerlendirilmiştir. Model, farklı ısıtma hızlarında yaşlandırma sıcaklığına ısıtılmış numunelerin sürtünme katsayılarını %76'nın üzerinde doğrulukla tahmin edebilmiştir.

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“…[19,20] Therefore, it is possible to fabricate strong and ductile Ti alloys on a large scale by controlling the precipitation of metastable phases and regulating their phase transformation sequence. Our recent results found that spinodal decomposition assisted phase separation [21,22] and metastable Oʹ phase [23][24][25] act as homogeneous nucleation sites for the formation of spatially uniform and dense distribution of fine α phase, thus leading to high strength. Especially, metastable phase Oʹ is more thermally stable within a wider temperature range than the ω counterpart, serving as a complementary way for microstructure engineering of high-strength β-Ti alloys.…”

mentioning

confidence: 98%

“…Especially, metastable phase Oʹ is more thermally stable within a wider temperature range than the ω counterpart, serving as a complementary way for microstructure engineering of high-strength β-Ti alloys. [24][25][26] In summary, by destabilizing β phase stability and taking usage of metastable phases as a medium to promote TWIP and TRIP effects or as the precursor to assist α precipitation, high-strength or ultrahigh-strength Ti alloys with an excellent combination of mechanical properties suitable for structural applications can be developed.…”

mentioning

confidence: 99%

Metastability Engineering in Titanium Alloys Enables Advanced Structural/Functional Properties

Xiao¹

2022

MatLab

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The concept of “metastability engineering” has been successfully used in metallic structural materials to enhance mechanical properties. In the present perspective, the authors propose that the metastability engineering strategy can be introduced to titanium (Ti) alloys by destabilizing the β phase and taking advantage of metastable phases mediated phase transformation and mechanical twinning. The utilization of metastability engineering strategy and associated structural and functional properties of Ti alloys are outlined.

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Formation of intermediate phases and their influences on the microstructure of high strength near-β titanium alloy

Cited by 23 publications

References 35 publications

Influence of intermetallic phase (TiFe) on the microstructural evolution and mechanical properties of as-cast and quenched Ti–Mo–Fe alloys

Influence of intermetallic phase (TiFe) on the microstructural evolution and mechanical properties of as-cast and quenched Ti–Mo–Fe alloys

Python Tabanlı Destek Vektörü Regresyon Modeli Kullanılarak Farklı Isıtma Hızlarında Yaşlandırılmış β Titanyum Alaşımının Sürtünme Katsayılarının Değerlendirilmesi

Metastability Engineering in Titanium Alloys Enables Advanced Structural/Functional Properties

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