Fe-Zn intermetallic phases prepared by diffusion annealing and spark-plasma sintering

Abstract

The feasibility of iron-zinc intermetallic-phase preparation by spark-plasma sintering (SPS) was investigated. The samples were prepared with a combination of powder metallurgy, where the powder was prepared in evacuated quartz tubes, and a sintering process using SPS. Since the Fe-Zn intermetallic phases are mostly used for hot-dip galvanized steels, the knowledge of the properties of individual intermetallic phases is vital for a better understanding and even further optimization of galvanization processes. The main aim of the article is to compare the phase composition of the initial powder with the SPS samples using X-ray diffraction. Furthermore, the hardness and microstructure were investigated as well. Keywords: Fe-Zn intermetallics, spark-plasma sintering, diffusion annealing, phase composition, hardness Preu~evana je bila izvedljivost priprave`elezo-cink intermetalnih faz s sintranjem v iskre~i plazmi (SPS). Vzorci so bili pripravljeni s pomo~jo metalurgije prahov, kjer so bili prahovi zaprti v evakuirane kvar~ne cevi, ki mu je sledil postopek SPS. Ker se Fe-Zn intermetalne faze ve~inoma uporablja pri vro~em cinkanju jekel, so lastnosti posamezne faze pomembne za bolj{e razumevanje in celo za optimiranje procesa galvanizacije. Glavni namen~lanka je primerjava sestave faz s pomo~jo rentgenske difrakcije v za~etnih prahovih in SPS vzorcih. Preiskovani sta bili tudi trdota in mikrostruktura. Klju~ne besede: Fe-Zn intermetalne zlitine, sintranje z iskre~o plazmo, difuzijsko`arjenje, sestava faz, trdota

Fabrication and characterization of A Zn-0.5Fe alloy membrane by powder metallurgy route for guided bone regeneration

“…XRD patterns showed that the Zn-0.5Fe membrane consists of Zn and FeZn 13 phase, which was matching with the Zn-Fe equilibrium phase diagram [10] and EDS results. The morphology of FeZn 13 phase in the membrane was different from that reported in previous literatures [11], which was caused by membrane produced by powder sintering.…”

The Impact of Heat Treatment on the Behavior of a Hot-Dip Zinc Coating Applied to Steel During Dry Friction

“…Generally, there are three phases occurring in the Fe–Zn diagram [ 5 , 6 , 7 ] as a result of the peritectic reaction—Γ-Fe 3 Zn 10 , δ-FeZn 7 , and ζ-FeZn 13 —and an iron solid solution in zinc-η, which settles on the surface as it is pulled out of the bath ( Figure 1 a). There is controversy concerning the order of zinc coating growth.…”

Comparison of the Tribological Properties of the Thermal Diffusion Zinc Coating to the Classic and Heat Treated Hot-Dip Zinc Coatings

“…The presented hardness changes are due to the changes in the microstructure (Г 1 +δ–suggested by results of EDS analysis), caused by diffusion of iron from the steel surface into the coating ( Figure 2 , Table 2 ). The hardness values measured by Pokorny [ 25 ] show that the δ phase is generally about 10% harder than the Г phase; the obtained hardness values of the δ phase were even in the range 330 to 460 HV. According to data [ 16 , 46 ], the δ phase in TD coating is harder by about 15% than the Г phase.…”

“… The microstructure of the zinc galvanizing coatings in relation to the Fe-Zn system; ( a )—hot-dip [ 22 ], ( b )—thermal diffusion [ 23 ], ( c )—Fe-Zn equilibrium system [ 24 , 25 ]. …”

“…According to the Fe-Zn diagram [ 24 , 25 , 26 ] ( Figure 1 c), there are three phases occurring in the hot-dip zinc coating —Г(Fe 3 Zn 10 ), δ (FeZn 10 , FeZn 7 ), and ζ (FeZn 13 )—and an iron solid solution in zinc—η, which is formed on the outer surface as it is pulled out of the bath ( Figure 1 a). The current model [ 22 ] suggests that the sequence of the zinc coating growth is as follows: first, the Г 1 phase is observed; next, within a few seconds, a sublayer of compact phase δ c and palisade phase δ p is created.…”