Ultrasonic Treatment of Ti-5Al-0.5 V Alloy Subjected to Equal-Channel Angular Pressing

被引:6
作者
Mukhametgalina, Aygul A. [1 ]
Murzinova, Mariya A. [1 ]
Nazarov, Ayrat A. [1 ]
Samigullina, Asiya A. [1 ]
Janecek, Milos [2 ]
Strasky, Josef [2 ]
Bartha, Kristina [2 ]
Cizek, Jakub [3 ]
机构
[1] Russian Acad Sci, Inst Met Superplast Problems, Ufa 450001, Russia
[2] Charles Univ Prague, Dept Phys Mat, Prague 12116 2, Czech Republic
[3] Charles Univ Prague, Dept Low Temp Phys, Prague 18000, Czech Republic
关键词
Ultrasonic treatment; Titanium alloy; Dislocation density; Strength; NONEQUILIBRIUM GRAIN-BOUNDARIES; MECHANICAL-PROPERTIES; NICKEL; BEHAVIOR; RELAXATION; POSITRON; TITANIUM; METALS; STRENGTH;
D O I
10.1007/s12540-021-01018-2
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Microstructure and room temperature mechanical properties of alpha-titanium alloy Ti-5Al-0.5 V subjected to equal channel angular pressing (ECAP) and subsequent ultrasonic treatment (UST) have been studied. The ECAP was carried out at 600 degrees C by route B-c and the UST at the frequency of 20 kHz and amplitude of compression-tension stresses of 100 MPa for processing time of 60 s. The dislocation densities after ECAP and subsequent UST were estimated by x-ray diffraction and positron lifetime spectroscopy. By the latter, vacancy concentration also was determined. It has been shown that UST results in a very little increase in the dislocation density and vacancy concentration and has no considerable effect on the mechanical properties of the ECAP-ed titanium alloys. Basing on the data obtained and earlier published results of computer simulations of the behavior of nonequilibrium grain boundaries in Ni and Ti under the action of ultrasound it is concluded that the structural transformations in Ti under UST occur at much higher stresses than in Ni, in which UST results in significant modifications of the structure and properties.
引用
收藏
页码:1257 / 1263
页数:7
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