Performance Comparison of Al–Ti Master Alloys with Different Microstructures in Grain Refinement of Commercial Purity Aluminum

Materials

Wanwu Ding¹  Tiandong Xia¹ 

[1] School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China; E-Mails:

关键词: Al–5Ti master alloy;    TiAl₃;    grain refining;    commercial purity Al;   

DOI  :  10.3390/ma7053663

来源: mdpi

【 摘 要 】

Three types of Al–5Ti master alloys were synthesized by a method of thermal explosion reaction in pure molten aluminum. Performance comparison of Al–5Ti master alloy in grain refinement of commercial purity Al with different additions (0.6%, 1.0%, 1.6%, 2.0%, and 3.0%) and holding time (10, 30, 60 and 120 min) were investigated. The results show that Al–5Ti master alloy with blocky TiAl₃ particles clearly has better refining efficiency than the master alloy with mixed TiAl₃ particles and the master alloy with needle-like TiAl₃ particles. The structures of master alloys, differing by sizes, morphologies and quantities of TiAl₃ crystals, were found to affect the pattern of the grain refining properties with the holding time. The grain refinement effect was revealed to reduce markedly for master alloys with needle–like TiAl₃ crystals and to show the further significant improvement at a longer holding time for the master alloy containing both larger needle–like and blocky TiAl₃ particles. For the master alloy with finer blocky particles, the grain refining effect did not obviously decrease during the whole studied range of the holding time.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland