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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 6    December 2007

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Effect of Y content on microstructure andmechanical properties of 2519 aluminum alloy
LI Hui-zhong(李慧中), LIANG Xiao-peng(梁霄鹏),LI Fang-fang(李芳芳),GUO Fei-fei(郭菲菲), LI Zhou(李 洲), ZHANG Xin-ming(张新明)

School of Materials Science and Engineering, Central South University,Changsha 410083, China

Abstract:The effects of yttrium(Y) content on precipitation hardening, elevated temperature mechanical properties and morphologies of 2519 aluminum alloy were investigated by means of microhardness test, tensile test, optical microscopy(OM), transmission electron microscopy(TEM) and scanning electron microscopy(SEM). The results show that the tensile strength increases from 485 MPa to 490 MPa by increasing Y content from 0 to 0.10%(mass fraction) at room temperature, and from 155 MPa to 205 MPa by increasing Y content from 0 to 0.20% at 300 ℃. The high strength of 2519 aluminum alloy is attruibuted to the high density of fine θ′ precipitates and intermetallic compound AlCuY with high thermal stability. Addition of Y above 0.20% in 2519 aluminum alloy may induce the decrease in the tensile strength both at room temperature (20 ℃) and 300 ℃.

 

Key words: 2519 aluminum alloy; yttrium; microstructure; mechanical properties

ISSN 1672-7029
CN 43-1423/U

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