Multicycle Surface Alloying of Aluminum with Titanium: Structure and Properties

2018 ◽  
Vol 781 ◽  
pp. 131-136
Author(s):  
Yurii Ivanov ◽  
Nikolay Koval ◽  
Olga V. Krysina ◽  
Pavel Moskvin ◽  
Elizaveta A. Petrikova ◽  
...  
Keyword(s):  
Intermetallic Layer ◽  
Pure Titanium ◽  
Vacuum Arc ◽  
Commercially Pure Titanium ◽  
Plasma Cathode ◽  
Mechanical And Tribological Properties ◽  
Commercially Pure ◽  
Film Substrate ◽  
Titanium Structure ◽  
Rapidly Solidified

Commercially pure A7 aluminum was surface alloyed with commercially pure titanium on COMPLEX equipment under unified vacuum conditions through vacuum arc evaporation and deposition of a thin Ti film and intense electron beam irradiation of the film–substrate system using a plasma-cathode pulsed electron source. The number of deposition–irradiation cycles was 20. The Ti film thickness in each cycle was 0.5 μm. After multicycle alloying, a modified surface layer of up to 60 μm thick was formed representing a multiphase structure of rapidly solidified submicro-and nanograins. The microhardness of the Ti–Al surface alloy (irradiation at 15 J/cm2, 50 μs, 10 pulses) was more than 8 times the microhardness of A7 aluminum, and its wear resistance and friction coefficient were respectively 45 times higher and 1.2 times lower than the values in the initial material. The chief cause for the improved mechanical and tribological properties of commercially pure A7 aluminum is the formation of an extended intermetallic layer.

Structure and Phase Composition of a Ti Film–Al Substrate System Irradiated with an Intense Pulsed Electron Beam

2018 ◽  
Vol 781 ◽  
pp. 101-107
Author(s):  
Yurii Ivanov ◽  
Olga V. Krysina ◽  
Pavel Moskvin ◽  
Elizaveta A. Petrikova ◽  
Olga V. Ivanova ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Electron Beam ◽  
High Surface ◽  
Pure Titanium ◽  
Surface Hardness ◽  
Vacuum Arc ◽  
High Wear Resistance ◽  
Commercially Pure Titanium ◽  
Plasma Cathode ◽  
Commercially Pure

Commercially pure A7 aluminum was exposed to surface modification in a single vacuum cycle which included vacuum arc evaporation and deposition of commercially pure titanium and intense electron beam irradiation and melting of the film–substrate system using a plasma-cathode pulsed electron source. The deposited Ti film thickness was 0.5 and 1 μm. The irradiated Ti–Al system revealed a multilayer multiphase structure consisting of submicro-and nanosized elements with intermetallic inclusions Al3Ti, Al2Ti, and TiAl3. The Ti film during irradiation broke up into fragments with their immersion in the molten Al surface layer to a depth of 20 μm. The modified material surpassed the initial aluminum in wear resistance by a factor of 2.4 and in microhardness by a factor larger than 4. The main cause for the high surface hardness and high wear resistance of the modified aluminum was likely the formation of both the intermetallic particles and the Ti-hardened transition layer.

Evolution of Microstructure and Mechanical Properties of Titanium Grade 4 with the Increase of the ECAP-Conform Passes

2010 ◽  
Vol 667-669 ◽  
pp. 1165-1170 ◽  
Author(s):  
Alexander V. Polyakov ◽  
Dmitriy Gunderov ◽  
Georgy I. Raab
Keyword(s):  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Structure And Properties ◽  
Deformation Bands ◽  
Angular Pressing ◽  
Commercially Pure ◽  
Ultrafine Grained ◽  
Titanium Grade ◽  
Titanium Structure ◽  
Evolution Of Microstructure

This work reports on the results of investigation of microstructure change of commercially pure titanium Grade 4 with the increase of the number of ECAP-Conform passes. There has been investigated influence of continuous equal-channel angular pressing by the scheme “Conform” (ECAP-C) on the structure and properties of commercially pure titanium Grade 4. It has been demonstrated that as a result of first two ECAP-C cycles titanium structure is strongly fragmented and deformation bands are formed. With the further increase of ECAP-C passes to 6 the band structure is transformed into ultrafine-grained (UFG) structure with the grain size of about 250 nm. The strength of titanium regularly grows with the increase of the number of ECAP-C passes, while ductility, which settles after first cycle on the level of 12%, is almost not changed with the further strain degree increase. As a result of the subsequent drawing of titanium after ECAP-C its strength additionally increases to 1300 MPa, with retention of ductility about 11%.

Investigation of Commercially Pure Titanium Structure during Accumulation and Release of Hydrogen by Means of Positron Lifetime and Electrical Resistivity Measurements

2014 ◽  
Vol 880 ◽  
pp. 93-100 ◽  
Author(s):  
Yuriy S. Bordulev ◽  
Roman S. Laptev ◽  
Viktor N. Kudiiarov ◽  
Andrey M. Lider
Keyword(s):  
Electrical Resistivity ◽  
Positron Lifetime ◽  
Vacuum Annealing ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
X Ray Diffraction ◽  
X Ray ◽  
Resistivity Measurements ◽  
Commercially Pure ◽  
Titanium Structure

In this work the goal was to study the behavior of titanium-hydrogen system with hydrogen concentration of 1 wt. % at high temperature vacuum annealing by means of positron lifetime (PL) spectroscopy and electrical resistivity measurements. The range of hydrogen concentrations under investigation requires the γ phase formation. The study is related with the X-ray diffraction (XRD) and thermal desorption spectra (TDS) analysis. The registered positron lifetime spectra were analyzed by multiexponential decomposition into two components. Correlation of changes of the parameters of the PL spectrum and the electrical resistivity is revealed in this paper.

Formation of the Intermetallic Layers in Ti-Al Multilayer Composites

2011 ◽  
Vol 311-313 ◽  
pp. 236-239 ◽  
Author(s):  
Vjacheslav I. Mali ◽  
Daria V. Pavliukova ◽  
Ivan A. Bataev ◽  
Anatoliy A. Bataev ◽  
Alexander I. Smirnov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Volume Fraction ◽  
Intermetallic Layer ◽  
Pure Aluminum ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Deformation Degree ◽  
Treatment Processes ◽  
Commercially Pure ◽  
Multilayer Composites

Commercially pure aluminum and commercially pure titanium plates have been explosively welded and annealed at temperature of 630 °C for 5, 20, 50 and 100 hours. The investigation of intermetallic formed during explosion welding and heat treatment processes has been carried out. The metallographic studies showed variation in the intermetallic volume fraction according to the deformation degree of different interfaces. Moreover the relation between the intermetallic layer thickness and time of explosively welded “Al-Ti” composite annealing has been found. The X-ray analysis reviled that intermetallic layer formed during the heat treatment process consisted of Al3Ti compound.

RMI 0.2% Pd

Alloy Digest ◽  
1979 ◽  
Vol 28 (12) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Crevice Corrosion ◽  
Elevated Temperatures ◽  
Pure Titanium ◽  
Heat Treating ◽  
Low Ph ◽  
Commercially Pure Titanium ◽  
Bend Strength ◽  
Commercially Pure ◽  
Minimum Yield

Abstract RMI 0.2% Pd is a grade of commercially pure titanium to which up to 0.2% palladium has been added. It has a guaranteed minimum yield strength of 40,000 psi with good ductility and formability. It is recommended for corrosion resistance in the chemical industry and other places where the environment is mildly reducing or varies between oxidizing and reducing. The alloy has improved resistance to crevice corrosion at low pH and elevated temperatures. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and bend strength. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ti-74. Producer or source: RMI Company.

UPM CP TITANIUM GRADE 3 (UNS R50550)

Alloy Digest ◽  
2020 ◽  
Vol 69 (6) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Pure Titanium ◽  
Heat Treating ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Continuous Service ◽  
Pure Grade ◽  
Grade 3 ◽  
Titanium Grade ◽  
Design Stress

Abstract UPM CP Titanium Grade 3 (UNS R50550) is an unalloyed commercially pure titanium that exhibits moderate strength (higher strength than that of Titanium Grade 2), along with excellent formability and corrosion resistance. It offers the highest ASME allowable design stress of any commercially pure grade of titanium, and can be used in continuous service up to 425 °C (800 °F) and in intermittent service up to 540 °C (1000 °F). This datasheet provides information on composition, physical properties, and elasticity. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ti-167. Producer or source: United Performance Metals.

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