Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 26    No. 5    May 2016

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Dynamic spheroidization kinetics behavior of Ti-6.5Al-2Zr-1Mo-1V alloy with lamellar microstructure
Xian-juan DONG1,2, Shi-qiang LU2, Hai-zhong ZHENG3

1. Aeronautical Science and Technology Key Laboratory of Aeronautical Materials Hot Processing Technology,
Nanchang Hangkong University, Nanchang 330063, China;
2. Institute of Aeronautic and Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China;
3. Institute of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China

Abstract:The dynamic spheroidization kinetics behavior of Ti-6.5Al-2Zr-1Mo-1V alloy with a lamellar initial microstructure was studied by isothermal hot compression tests in the temperature range of 750-950 °C and strain rates of 0.001-10 s-1. The results show that the spheroidized fraction of alpha lamellae increases with the increase of temperature and the decrease of strain rate. The spheroidization kinetics curves predicted by JMAK equation agree well with experimental ones. The corresponding SEM and TEM observations indicate that the dynamic spheroidization process can be divided into two stages. The primary stage is boundary splitting formed by two competing mechanisms which are dynamic recrystallization and mechanical twin. In the second stage, the penetration of beta phase into the alpha/alpha grain boundaries is dominant, which is controlled in nature by diffusion of the chemical elements such as Al, Mo and V.

 

Key words: titanium alloy; lamellar microstructure; spheroidization; kinetics equation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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