Local Graded Structure in 6.5wt%Si-Fe Alloy and the Effect on Ductility

2005 ◽  
Vol 492-493 ◽  
pp. 59-62 ◽  
Author(s):  
Qiang Shen ◽  
Ran Li ◽  
Lian Meng Zhang
Keyword(s):  
Phase Composition ◽  
Powder Metallurgy ◽  
Deformation Behavior ◽  
Powder Metallurgy Method ◽  
Silicon Phase ◽  
Silicon Iron ◽  
Graded Structure ◽  
Composition And Structure ◽  
High Silicon ◽  
Si Content

The changes of phase composition and structure evolvement of Fe and Si powders with the ratio of 6.5wt%Si to 93.5wt%Fe were mainly studied. It is found that, the local graded structure, Fe-Fe(Si)-Fe3Si-(FeSi)-Si, forms due to the obvious diffusion and the alloying reaction between Fe and Si powders when sintering at 900-975oC. The graded structure, in which the high silicon phase based on Fe-Si alloys is packed by the low silicon solution based on Fe, exhibits a graded concentration of Si distribution. And most of the Fe-containing phase remains a state of lower Si content, less than that of 3wt%Si-Fe alloy, thus provides the good deformation behavior of rolling and cutting for the compacts. Therefore, it is feasible for the high silicon iron sheets to be produced by the powder metallurgy method.

Sintering Behavior of Fe-Si Composite Powder by DPR Technique

2007 ◽  
Vol 336-338 ◽  
pp. 2344-2346 ◽  
Author(s):  
Qiang Shen ◽  
Y. Zhou ◽  
Jun Guo Li ◽  
W.J. Yuan ◽  
Lian Meng Zhang
Keyword(s):  
Phase Composition ◽  
Reaction Mechanism ◽  
Composite Powder ◽  
Sintering Behavior ◽  
Composite Powders ◽  
Silicon Iron ◽  
Graded Structure ◽  
Composition And Structure ◽  
High Silicon ◽  
Si Content

The reaction mechanism of silicon and iron composite powders was clarified during the fabrication of high silicon iron sheet with the Si-content of 6.5wt% by Direct Powder Rolling (DPR) technique. The changes of phase composition and structure evolvement were mainly studied. It is found that a local graded structure, Fe-Fe(Si)-Fe3Si(Si)-Si, forms when sintering at 950-1000oC, which plays an important role in the DPR process. Fe3Si(Si) phase keeps higher content of Si, and Fe(Si) phase remains the state with much lower Si-content, thus provides good mechanical proprieties of rolling and cutting. Then, the subsequent sintering at about 1200oC improves the density and makes the distribution of Si homogeneous in the final high silicon iron sheets.

scholarly journals Structure and phase composition of hypereutectic silumin alloy Al – 20Si after compression plasma flows impact

2021 ◽  
pp. 25-33
Author(s):  
Vitali I. Shymanski ◽  
Antons Jevdokimovs ◽  
Nikolai N. Cherenda ◽  
Valiantsin M. Astashynski ◽  
Elizaveta A. Petrikova
Keyword(s):  
Phase Composition ◽  
Method Development ◽  
Diffraction Method ◽  
High Energy ◽  
High Rate ◽  
X Ray Diffraction ◽  
Plasma Flows ◽  
Silicon Phase ◽  
Compression Plasma Flows ◽  
Si Content

The results of structure and phase composition investigation in hypereutectic silumin alloy with 25 at. % Si content after high-energy pulsed compression plasma flows impact are presented in the work. The compression plasma flows impact with an absorbed energy density 25 – 40 J/cm2 allows to modify the sub-surface layer with a thickness up to 30 – 32 µm due to its melting and high rate solidification. By means of X-ray diffraction method, it was found the formation of two silicon phases with different grain sizes. The high-dispersed structure of silicon is presented in the Al-Si eutectic while the silicon phase with coarse grains exists in the primary crystals. The obtained results are the basis for a new method development for nanostructuring of the surface layers of hypereutectic silumin alloys increasing its wear resistance.

Study on Preparation of Gradient Porous NiTi Alloys by Powder Metallurgy Method

2011 ◽  
Vol 299-300 ◽  
pp. 671-674
Author(s):  
Qiang Li ◽  
Jing Yuan Yu ◽  
Guo Chao Qi
Keyword(s):  
Phase Composition ◽  
Elastic Modulus ◽  
Powder Metallurgy ◽  
Porous Materials ◽  
Niti Alloy ◽  
Powder Metallurgy Method ◽  
Compressive Properties ◽  
Niti Alloys ◽  
Porous Niti ◽  
Tini Phase

Gradient porous NiTi alloys were fabricated by powder metallurgy method using NH4HCO3as space-holder. The effect of content and distribution of NH4HCO3on pore characteristic, phase composition and compressive properties was studied. The results showed the content of TiNi phase increased with the decrease of the content of NH4HCO3. When the distribution of NH4HCO3varying form 12wt%-12wt%-12wt% to 12wt%-6wt%-12wt% and 12wt%-0wt%-12wt%, the stress and elastic modulus of porous NiTi alloys increased from 228MPa to 321MP and 446MPa, from 4.8GPa to 5.6GPa and 6.8GPa, respectively. Compared with uniform porous materials, gradient porous NiTi alloy exhibited better superelasticity.

EFFECT OF ADDITION OF THIRD ELEMENT IN HIGH SILICON-IRON ALLOY

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-133-C8-134
Author(s):  
H. Nakamura ◽  
N. Tsuya ◽  
Y. Saito ◽  
Y. Katsumata ◽  
Y. Harada
Keyword(s):  
Iron Alloy ◽  
Silicon Iron ◽  
High Silicon

Role of Aluminium on the Microstructure and Corrosion Behaviour of Magnesium Prepared by Powder Metallurgy Method

2020 ◽  
Vol 17 (3) ◽  
pp. 8206-8213
Author(s):  
J. Alias
Keyword(s):  
Corrosion Resistance ◽  
Powder Metallurgy ◽  
Corrosion Behaviour ◽  
Corrosion Current ◽  
Optical Microscope ◽  
High Reactivity ◽  
Aluminium Content ◽  
Powder Metallurgy Method ◽  
X Ray Diffraction ◽  
Promising Development

Much research on magnesium (Mg) emphasises creating good corrosion resistance of magnesium, due to its high reactivity in most environments. In this study, powder metallurgy (PM) technique is used to produce Mg samples with a variation of aluminium (Al) composition. The effect of aluminium composition on the microstructure development, including the phase analysis was characterised by optical microscope (OM), scanning electron microscopy (SEM) and x-ray diffraction (XRD). The mechanical property of Mg sample was performed through Vickers microhardness. The results showed that the addition of aluminium in the synthesised Mg sample formed distribution of Al-rich phases of Mg17Al12, with 50 wt.% of aluminium content in the Mg sample exhibited larger fraction and distribution of Al-rich phases as compared to the 20 wt.% and 10 wt.% of aluminium content. The microhardness values were also increased at 20 wt.% and 50 wt.% of aluminium content, comparable to the standard microhardness value of the annealed Mg. A similar trend in corrosion resistance of the Mg immersed in 3.5 wt.% NaCl solution was observed. The corrosion behaviour was evaluated based on potentiodynamic polarisation behaviour. The corrosion current density, icorr, is observed to decrease with the increase of Al composition in the Mg sample, corresponding to the increase in corrosion resistance due to the formation of aluminium oxide layer on the Al-rich surface that acted as the corrosion barrier. Overall, the inclusion of aluminium in this study demonstrates the promising development of high corrosion resistant Mg alloys.

DURICHLOR 51M

Alloy Digest ◽  
1996 ◽  
Vol 45 (4) ◽  
Keyword(s):  
Compressive Strength ◽  
Corrosion Resistance ◽  
Hydrochloric Acid ◽  
Physical Properties ◽  
Tensile Properties ◽  
Silicon Iron ◽  
Chlorine Gas ◽  
High Silicon

Abstract Durichlor 51M is a high silicon iron for corrosive services, especially in the handling of hydrochloric acid in all concentrations. It is also very resistant to most chlorine gas and many destructive chloride-containing solutions. The alloy is treated at melting by argon ladle degassing. This datasheet provides information on composition, physical properties, hardness, tensile properties, and compressive strength. It also includes information on corrosion resistance as well as machining and joining. Filing Code: FE-109. Producer or source: The Duriron Company Inc.

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