Hot Deformation Behavior and Microstructural Evolution Characteristics of Ti-44Al-5V-1Cr Alloy Containing (γ + α2 + B2) Phases
The hot deformation behavior and microstructural evolution of Ti-44Al-5V-1Cr alloy were investigated by hot compression tests at temperatures of 1000–1250 °C and strain rates of 0.001–1 s−1. It was indicated that the dependence of peak stress on deformation temperature and strain rate could be accur...
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doaj-ae126fbd651640eca7862c3cc5575dc82020-11-24T23:26:23ZengMDPI AGMetals2075-47012016-12-0161230510.3390/met6120305met6120305Hot Deformation Behavior and Microstructural Evolution Characteristics of Ti-44Al-5V-1Cr Alloy Containing (γ + α2 + B2) PhasesHongwu Liu0Rong Rong1Fan Gao2Zhenxi Li3Yanguo Liu4Qingfeng Wang5State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, ChinaState Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, ChinaTitanium Alloys Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaTitanium Alloys Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaSchool of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, ChinaState Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, ChinaThe hot deformation behavior and microstructural evolution of Ti-44Al-5V-1Cr alloy were investigated by hot compression tests at temperatures of 1000–1250 °C and strain rates of 0.001–1 s−1. It was indicated that the dependence of peak stress on deformation temperature and strain rate could be accurately described by a hyperbolic sine type equation. The activation energy, Q, was estimated to be 632 kJ/mol. The hot processing map was developed at different strains on the basis of dynamic materials modeling and the Murty criteria. As a result, the instability zones occurred in the regions of low temperature (<1050 °C) and a high strain rate (>0.1 s−1). The flow soft mechanism of the instability regions is stress relaxation caused by localization deformation at lamellar boundaries. Dynamic recrystallization is the mainly refining and spheroidizing mechanism of lamellar microstructures. The optimum hot working condition of as-cast TiAl alloy occurs in the temperature range of 1175–1225 °C and the strain rate range 0.05–0.1 s−1. The large-size TiAl alloy rectangular bars with crack-free appearance were successfully prepared by hot extrusion. After annealing, the fine and uniform microstructure with excellent deformation ability was obtained.http://www.mdpi.com/2075-4701/6/12/305TiAl alloyhot deformation behaviormicrostructuredynamic recrystallizationhot extrusion |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hongwu Liu Rong Rong Fan Gao Zhenxi Li Yanguo Liu Qingfeng Wang |
spellingShingle |
Hongwu Liu Rong Rong Fan Gao Zhenxi Li Yanguo Liu Qingfeng Wang Hot Deformation Behavior and Microstructural Evolution Characteristics of Ti-44Al-5V-1Cr Alloy Containing (γ + α2 + B2) Phases Metals TiAl alloy hot deformation behavior microstructure dynamic recrystallization hot extrusion |
author_facet |
Hongwu Liu Rong Rong Fan Gao Zhenxi Li Yanguo Liu Qingfeng Wang |
author_sort |
Hongwu Liu |
title |
Hot Deformation Behavior and Microstructural Evolution Characteristics of Ti-44Al-5V-1Cr Alloy Containing (γ + α2 + B2) Phases |
title_short |
Hot Deformation Behavior and Microstructural Evolution Characteristics of Ti-44Al-5V-1Cr Alloy Containing (γ + α2 + B2) Phases |
title_full |
Hot Deformation Behavior and Microstructural Evolution Characteristics of Ti-44Al-5V-1Cr Alloy Containing (γ + α2 + B2) Phases |
title_fullStr |
Hot Deformation Behavior and Microstructural Evolution Characteristics of Ti-44Al-5V-1Cr Alloy Containing (γ + α2 + B2) Phases |
title_full_unstemmed |
Hot Deformation Behavior and Microstructural Evolution Characteristics of Ti-44Al-5V-1Cr Alloy Containing (γ + α2 + B2) Phases |
title_sort |
hot deformation behavior and microstructural evolution characteristics of ti-44al-5v-1cr alloy containing (γ + α2 + b2) phases |
publisher |
MDPI AG |
series |
Metals |
issn |
2075-4701 |
publishDate |
2016-12-01 |
description |
The hot deformation behavior and microstructural evolution of Ti-44Al-5V-1Cr alloy were investigated by hot compression tests at temperatures of 1000–1250 °C and strain rates of 0.001–1 s−1. It was indicated that the dependence of peak stress on deformation temperature and strain rate could be accurately described by a hyperbolic sine type equation. The activation energy, Q, was estimated to be 632 kJ/mol. The hot processing map was developed at different strains on the basis of dynamic materials modeling and the Murty criteria. As a result, the instability zones occurred in the regions of low temperature (<1050 °C) and a high strain rate (>0.1 s−1). The flow soft mechanism of the instability regions is stress relaxation caused by localization deformation at lamellar boundaries. Dynamic recrystallization is the mainly refining and spheroidizing mechanism of lamellar microstructures. The optimum hot working condition of as-cast TiAl alloy occurs in the temperature range of 1175–1225 °C and the strain rate range 0.05–0.1 s−1. The large-size TiAl alloy rectangular bars with crack-free appearance were successfully prepared by hot extrusion. After annealing, the fine and uniform microstructure with excellent deformation ability was obtained. |
topic |
TiAl alloy hot deformation behavior microstructure dynamic recrystallization hot extrusion |
url |
http://www.mdpi.com/2075-4701/6/12/305 |
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