Publication: Microstructure formation and mechanical properties of isothermally-solidified titanium alloy joints brazed by a Ti - Zr - Cu - Ni - Be amorphous alloy foil
Дата
2020
Авторы
Morokhov, P. V.
Ivannikov, А. A.
Popov, N. S.
Sevryukov, O. N.
Journal Title
Journal ISSN
Volume Title
Издатель
Аннотация
Two titanium alloys, OT4 and VT6-c, with a pseudo-alpha and alpha + beta structure, respectively, were brazed using transient liquid phase (TLP) bonding. To obtain high strength joints an amorphous foil (Ti - 12Zr - 22Cu - 12Ni - 1.5 Be - 0.8V wt.%) was used. Based on microstructural studies and analysis of two- and three-component phase diagrams, the mechanism of the microstructural evolution of the brazed seams of titanium alloys OT4 and VT6-c is described. Brazing at 800 oC with exposure for 0.5 h leads to the formation of a heterogeneous structure consisting of Widmanstatten, eutectoid, and eutectic. Brazed OT4 and VT6-c joints with the presence of a eutectic layer in the centre show low mechanical properties; their ultimate strength lies in a range from 200 to 550 MPa. Increasing the brazing temperature to 840 degrees C and the exposure time to 2 h, leads to the disappearance of the brittle eutectic component from the seam. This structure typically consists of Widmanstatten with a small number of eutectoid fractions. Joints with the absence of a eutectic layer in the brazed seam demonstrate a strength equal to the base titanium alloys. In this case, failure occurs in the base metal. For brazed samples from the OT4 alloy, the tensile strength value is sigma(b) = 750 +/- 3 MPa, and for samples from VT6- c, sigma(b) = 905 +/- 3 MPa.
Описание
Ключевые слова
Цитирование
Microstructure formation and mechanical properties of isothermally-solidified titanium alloy joints brazed by a Ti - Zr - Cu - Ni - Be amorphous alloy foil / Morokhov, PV [et al.] // Non-ferrous Metals. - 2020. - № 2. - P. 63-72. - 10.17580/nfm.2020.02.08
URI
https://www.doi.org/10.17580/nfm.2020.02.08
https://www.scopus.com/record/display.uri?eid=2-s2.0-85100850011&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000604746400008
https://openrepository.mephi.ru/handle/123456789/23048
https://www.scopus.com/record/display.uri?eid=2-s2.0-85100850011&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000604746400008
https://openrepository.mephi.ru/handle/123456789/23048