"Property optimisation of titanium alloys based on phase stability evaluation and microstructure design"
By Rui Yang, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Abstract
Titanium alloys are extensively used in aircraft engines and have emerged as ideal materials for a wide range of biomedical implants. Applications of titanium alloys in such reliability sensitive components/devices require a thorough understanding and precise control of properties which are determined by the rich variety of phase transformations and multi scale microstructures. In many cases experimental investigations have already pointed to one or several key processes or parameters that dominate the properties and service performance of the alloys. Under such circumstances the computational and modelling tasks are relatively well defined and the results can be critical in clarifying and solving the problems. This talk will review work conducted in the past few years using such an experiment plus computation approach, taking examples from near-alpha titanium alloys and titanium aluminides for aero engine applications and from beta-type titanium alloys for biomedical use. The topics to be covered include alloying effects on the alpha phase and their relations to creep resistance and cold dwell fatigue propensity, alloying effects, phase stability and deformation mechanisms of high strength titanium aluminides, and metastable phases and stress induced transformations in beta-type titanium alloys.
Speaker Biography
Rui Yang has been the head of Titanium Alloys Division of the CAS Institute of Metal Research since 1997. He graduated from the Department of Mechanical Engineering of Wuhan Institute of Hydraulic and Electric Engineering and obtained an MSc degree from IMR-CAS, before reading for his PhD degree in Materials Science and Metallurgy at the University of Cambridge. He subsequently worked in Cambridge as a St John’s College Title A Research Fellow before returning to IMR CAS in 1995. He served as a Deputy Director of IMR-CAS from 2001 to 2012 and the Director from 2012 to 2018. Dr Yang’s research centred on the development of titanium alloys and component forming technologies. The titanium aluminide casting stock and centrifugal casting processes developed in his group were used to manufacture low pressure turbine blades which successfully passed ground tests on Trent XWB engines at Rolls Royce.
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Abstract
Titanium alloys are extensively used in aircraft engines and have emerged as ideal materials for a wide range of biomedical implants. Applications of titanium alloys in such reliability sensitive components/devices require a thorough understanding and precise control of properties which are determined by the rich variety of phase transformations and multi scale microstructures. In many cases experimental investigations have already pointed to one or several key processes or parameters that dominate the properties and service performance of the alloys. Under such circumstances the computational and modelling tasks are relatively well defined and the results can be critical in clarifying and solving the problems. This talk will review work conducted in the past few years using such an experiment plus computation approach, taking examples from near-alpha titanium alloys and titanium aluminides for aero engine applications and from beta-type titanium alloys for biomedical use. The topics to be covered include alloying effects on the alpha phase and their relations to creep resistance and cold dwell fatigue propensity, alloying effects, phase stability and deformation mechanisms of high strength titanium aluminides, and metastable phases and stress induced transformations in beta-type titanium alloys.
Speaker Biography
Rui Yang has been the head of Titanium Alloys Division of the CAS Institute of Metal Research since 1997. He graduated from the Department of Mechanical Engineering of Wuhan Institute of Hydraulic and Electric Engineering and obtained an MSc degree from IMR-CAS, before reading for his PhD degree in Materials Science and Metallurgy at the University of Cambridge. He subsequently worked in Cambridge as a St John’s College Title A Research Fellow before returning to IMR CAS in 1995. He served as a Deputy Director of IMR-CAS from 2001 to 2012 and the Director from 2012 to 2018. Dr Yang’s research centred on the development of titanium alloys and component forming technologies. The titanium aluminide casting stock and centrifugal casting processes developed in his group were used to manufacture low pressure turbine blades which successfully passed ground tests on Trent XWB engines at Rolls Royce.
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