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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 1    February 2001

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Structural evolution of ZA27 alloy
during semi-solid isothermal heat treatment
CHEN Ti-jun(陈体军)1,2, MA Ying(马  颖)1, HAO Yuan(郝  远)1,
LU Song(陆  松)1, XU Guang-ji(许广济)1, SUN Jun(孙  军)

1. School of Materials Science and Engineering,
Gansu University of Technology,Lanzhou 730050, P.R.China;
 2. State Key Laboratory for Mechanical Behavior of Materials,
Xi′an Jiaotong University,Xi′an 710049, P.R.China

Abstract:The structural evolution of ZA27 alloy modified by element Zr was studied during semisolid isothermal heat treatment, and its transformation mechanism was also discussed. The results indicate that the primary α phase changes from equiaxed grains to spherical grains gradually at semisolid temperature of 460. With increasing isothermal time, the eutectic between boundaries ofα phase diffuses toward α phase, and the primary equiaxed grain arms merge and boundaries tend to disappear to form near particle grains. Further, the eutectic left on α boundaries melts to make the near particle grains separate, and form spherical structure at last.

 

Key words:   ZA27 alloy; semi-solid state; isothermal heat treatment; structural evolution; spherical structure

ISSN 1672-7029
CN 43-1423/U

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