Abstract This paper presents the study of finishing, repair, and maintenance turning operations gamma titanium aluminide (?-TiAl) parts from aeronautic industry, with aim to evaluate different sustainable lubrication/cooling environments, including a newly developed synthetic ester water-based metalworking fluid (EcoMWF) replace mineral-based MWF (MWF). The systems considered in this work are d...

Metallic-intermetallic laminate (MIL) composites are promising materials for structural applications especially in the aerospace industry. One of the interesting laminate composites is the Ti-TiAl 3 multilayer. In this work, commercially pure sheets of aluminum and titanium with almost equal thickness of around 0.5 mm were explosively joined. The achieved multilayers were annealed at 630 ℃in di...

In this work, plastic deformation was locally introduced at room temperature by 12 nanoindentation on a γ-TiAl based alloy. Comprehensive analyzes of microstructures were 13 performed before and after deformation. In particular, the Burgers vectors, the line directions and 14 the mechanical twinning systems were studied via accurate electron channeling contrast imaging. 15 Accommodation of the ...

The process of preparing SiC fiber-reinforced γ-TiAl composites by the conventional methods is difficult and complicated due to high reactivity, melting point poor deformability alloys. In this work, suction casting, a promising method for SiCf/TiAl composite, had been attempted. process, alloy melt was introduced rapidly into mold within pre-arranged fibers that were coated with additional lay...

ÐThe high-temperature fatigue-crack propagation and fracture resistance of a model g-TiAl intermetallic composite reinforced with 20 vol.% ductile b-TiNb particles is examined at elevated temperatures of 650 and 8008C and compared with behavior at room temperature. TiNb reinforcements are found to enhance the fracture toughness of g-TiAl, even at high temperatures, from about 12 to 040 MPa m, a...

Water Droplet Erosion (WDE) as a material degradation phenomenon has been a concern in power generation industries for decades. Steam turbine blades and the compressor blades of gas turbines that use water injection usually suffer from WDE. The present work focuses on studying erosion resistance of TiAl as a potential alloy for turbine blades compared to Ti6Al4V, a frequently used blade alloy. ...

A math e mat i cal model rep re sent ing tem per a ture and mois ture con tent in bread dur ing bak ing is de vel oped. The model em ploys the cou pled par tial dif fer en tial equa tions pro posed by Luikov. Dependences of mass and ther mal prop er ties of dough on tem per a ture and mois ture con tent are in cluded in the model. Re sult ing sys tem of non-lin ear par tial dif fer en tial equa...

TiAl with between 0 and 20 volume percent (v%)Ti5Si3 was produced by reactive sintering of cofd pressed compacts of elemental Ti, Al and Si powder mixtures at 7OO0C for 15 minutes in vacuum. The results show that adding Si to Ti and A1 reduces the swelling associated with reactive sintering of TiAI, as composites containing more than 5 vYoTigSi3 densified during reactive sintering. However, com...

Mixtures of 47-Al and 53-Ti powders (atomic %) have been consolidated using back pressure equal-channel angular pressing starting with both raw and ball-milled powders. In situ synchrotron high-energy X-ray diffraction studies are presented with continuous Rietveld analysis obtained upon a heating ramp from 300 K to 1075 K performed after the consolidation process. Initial phase distributions c...

In the last decades, the class of Ti-rich TiAl-based intermetallic materials has replaced many contemporary alloys till 900 °C. Due to higher oxidation resistance, 20% lower density and higher (about 150 °C more) operating temperature possibility of Al-rich TiAl alloys over Ti-rich side, phases from the Al-rich region of this alloy system are considered to be highly potential candidates for hig...