INTERDIFUSI EFEKTIF-FUNGSI KONSENTRASI DI DALAM PADUAN TERNER Ni-Re-X (X=Ru, Co)[Concentration-Dependent Effective Interdiffusion in Ni-Re-X (X=Ru, Co) Ternarry Alloys]

Efendi Mabruri

Abstract

INTERDIFUSI EFEKTIF-FUNGSI KONSENTRASI DI DALAM PADUAN TERNER Ni-Re-X (X=Ru,
Co). Tulisan ini berkaitan dengan penelaahan perilaku interdifusi unsur refraktori Re dengan unsur-unsur
penting lain di dalam superalloy berbasis nikel dengan mengases koefisien interdifusi efektif sebagai fungi
konsentrasi,
eff
i
~D
di dalam paduan terner Ni-Re-X (X= Ru, Co). Hasil asesmen menunjukan bahwa harga
koefisien interdifusi efektif untuk Re lebih rendah dibandingkan dengan koefisien interdifusi efektif untuk Ru
dan Co berdasarkan urutan
eff
Re
~D
<
eff
Ru
~D
<
eff
Co
~D
. Gradien konsentrasi Re mempunyai pengaruh yang lebih besar
terhadap
eff
Ru
~D
atau
eff
Co
~D
dibandingkan dengan pengaruh gradien konsentrasi masing-masing unsur (Ru, Co).
Sebaliknya, koefisien interdifusi efektif
eff
Re
~D
relatif tidak dipengaruhi oleh gradien konsentrasi Ru dan Co pada
masing-masing sistem. Perilaku interdifusi ini merefleksikan bahwa ikatan antar atom Ru-Re atau Co-Re lebih
besar dibandingkan ikatan antar atom Ni-Ru atau Ni-Co.

 

Abstract

This paper is addressed to the study of interdiffusion behaviour of refractory element Re with other important
elements in nickel based superalloys by assesing the concentration dependence-effective interdifusion
coefficients
eff
i
~D
in the ternary systems of Ni-Re-X (X= Ru, Co). The assesment results showed that the
effective interdifusion coefficient for Re was smaller than that for Ru and Co in the order of
eff
Re
~D
<
eff
Ru
~D
<
eff
Co
~D
. The concentration gradient of Re had a larger influence on
eff
Ru
~D
and
eff
Co
~D
than the own concentration
gradient of Ru and Co, respectively. On the other hand, the effective interdifusion coefficient of Re,
eff
Re
~D
was not influenced by the concentration gradient of Ru and Co in the respective system. This
interdiffusion behaviour reflects that the atomic bond of Ru-Re and Co-Re is larger compared to that of Ni-
Ru and Ni-Co, respectively.


Keywords

Interdifusi efektif; Superalloy berbasis nikel; Unsur refraktori; Nikel-rhenium; Ruthenium; Kobal; Effective interdifusion; Nickel based superalloys; Refractory element; Nickel-rhenium; Ruthenium; Cobalt
Copyright (c) 2017 Metalurgi
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