EFFECT OF HIGH MAGNETIC FIELD ON THE TRANSITION BEHAVIOR OF Cu–RICH PARTICLES IN Cu–80%Pb HYPERMONOTECTIC ALLOY
Received date: 2009-09-21
Revised date: 2010-01-27
Online published: 2010-04-11
Supported by
Supported by National Natural Science Foundation of China (Nos.50574027 and 50901019), High Technology Research and Development Program of China (No.2007AA03Z519), Specialized Research Found for the Doctoral Program of Higher Education (No.20070145062), and 111 project (No.B07015)
The Cu–80%Pb(mass fraction) hypermonotectic alloy with a dense distribution of Cu–rich particles was annealed at different temperatures under high magnetic field, the transition behavior of Cu–rich particles in solid–liquid mixture zone was investigated. The results show that, the transition behavior of Cu–rich particles occurs above 800 ℃, a compact segregation layer forms in the sample top above 900 ℃, the particle size and transition velocity increase with annealing temperature increasing. The Cu–rich particles grow and coalesce with each other during transiting, the coalescence mechanism is different from Cu–rich droplets. The clster of Cu–rich particles float up wholly, leave a clear boundary between Cu–rich particle and Cu–rich dendrite zones, the mutual interaction between the prticles makes the trnsition velocity decreased. The high magnetic field has effect on decreasing the transition velocity of Cu–rich particles, inhibiting the coarsening and coalescing of Cu–rich particles, which could decrease the segregation of Cu–rich particles, and inhibit the formation of compact Cu–rich segregation layers. Based on the mutual interaction between the particles, the acting forces on the Cu–rich particles and the final velocity have been analyzed and calculated to show the influence of magnetic field.
Key words： Cu–Pb alloy; monotectic alloy; particle transition; high magnetic field
ZHANG Lin , YU En-Gang , ZUO Xiao-Wei , SHI Ji-Cheng . EFFECT OF HIGH MAGNETIC FIELD ON THE TRANSITION BEHAVIOR OF Cu–RICH PARTICLES IN Cu–80%Pb HYPERMONOTECTIC ALLOY[J]. Acta Metall Sin, 2010 , 46(4) : 423 -428 . DOI: 10.3724/SP.J.1037.2009.00629
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