• PDF / 195,179 Bytes
• 2 Pages / 593.972 x 792 pts Page_size
• 97 Downloads / 153 Views

DOWNLOAD

REPORT

---

ection II: Phase Diagram Evaluations

Fe-Ni-Si-Zn (Iron-Nickel-Silicon-Zinc) V. Raghavan

The earlier study of [2002Su] of this quaternary system was briefly reviewed by [2003Rag1], who presented an isothermal section at 450  C and at 93 at.% Zn. Recently, [2009Yin] extended this work and determined an isothermal section at 560  C and 93 at.% Zn.

Ternary Subsystems Several updates have been written on the phase equilibria in the Fe-Ni-Si ternary system, with the latest by [2010Rag]. A ternary compound Fe5 Ni3 Si2 ðAu4 Al-type cubic) is present at 850  C in this system. Updates on the Fe-Ni-Zn system by [2003Rag2] and [2007Rag1] presented isothermal sections at 450 and 560  C respectively. A ternary phase denoted T by [2005Pen] (C01 by [2007Rag1]) is present at 560  C and is isostructural with C1 . The Fe-Si-Zn system was updated by [2003Rag3] and [2007Rag2], giving three isothermal sections, at 450  C from [2001Su] and at 480 and 405  C from [2005Wan]. An unpublished isothermal section at 560  C is given by [2009Yin].

Fig. 1

162

Quaternary Phase Equilibria With starting metals of 99.99% purity, [2009Yin] melted 13 quaternary alloys with a constant Zn content of 93 at.%. The alloys were annealed at 560  C for 21 days and quenched in water. The phase equilibria were studied with x-ray powder diffraction and optical and scanning electron microscopy. The compositions of the identified phases measured with the energy dispersive x-ray analyzer were listed. The isothermal section at 560  C and at 93 at.% Zn constructed by [2009Yin] is shown in Fig. 1. The Fe-Zn d phase dissolves 2.0 at.% Ni and 0.2 at.% Si. NiSi2 dissolves 6.3 at.% Fe and 4.6 at.% Zn. The ternary phase T contains 6.7 at.% Ni and 0.4 at.% Si.

References 2001Su: X. Su, N.Y. Tang, and J.M. Toguri, 450 C Isothermal Section of the Fe-Zn-Si Ternary Phase Diagram, Can. Metall. Q., 2001, 40(3), p 377-384

Fe-Ni-Si-Zn isothermal section at 560  C and at 93 at.% Zn [2009Yin]

Journal of Phase Equilibria and Diffusion Vol. 32 No. 2 2011

Phase Diagram Evaluations: Section II 2002Su: X.P. Su and N.Y. Tang, The Zinc Rich Corner of the Zn-Fe-Ni-Si Quaternary System at 450 C, J. Phase Equilb., 2002, 23(5), p 424-431 2003Rag1: V. Raghavan, Fe-Ni-Si-Zn (Iron-Nickel-Silicon-Zinc), J. Phase Equilib., 2003, 24(6), p 569-570 2003Rag2: V. Raghavan, Fe-Ni-Zn (Iron-Nickel-Zinc), J. Phase Equilib., 2003, 24(6), p 558-560 2003Rag3: V. Raghavan, Fe-Si-Zn (Iron-Silicon-Zinc), J. Phase Equilib., 2003, 24(6), p 562-563 2005Pen: F. Peng, F. Yin, X. Su, Z. Li, and M. Zhao, 560 C Isothermal Section of Zn-Fe-Ni System at the Zn-Rich Corner, J. Alloys Compd., 2005, 402, p 124-129

2005Wan: J. Wang, X. Su, F. Yin, Z. Li, and M. Zhao, The 480 C and 405 C Isothermal Sections of the Phase Diagram of the Fe-ZnSi Ternary System, J. Alloys Compd., 2005, 399, p 214-218 2007Rag1: V. Raghavan, Fe-Ni-Zn (Iron-Nickel-Zinc), J. Phase Equilib. Diffus., 2007, 28(4), p 394 2007Rag2: V. Raghavan, Fe-Si-Zn (Iron-Silicon-Zinc), J. Phase Equilib. Diffus., 2007, 28(4), p 395-396 2009Yin: F. Y