Characteristics of Ni- Cr Binary Alloys Produced by Conventional Powder Metallurgy

The characteristics of Ni-Cr porous alloys containing 0.5 wt%Cr up to 12 wt%Cr were determined. The alloys were prepared from a mix of Ni-particles with filamentary shape and Cr-particles with irregular shape which then mixed with 0.5 wt% paraffin wax as a binder. The samples were formed by compaction and then sintered at 1200 °C for 1 h. The microstructure of samples was found to consist of a Ni-Cr solid solution matrix with X-ray energy dispersive analysis of Cr% less than 0.33 wt%. The matrix microstructure which composed of equiaxed grains (20-60 μm) surrounded high Cr content islands which also contained γ phase (Ni2.88 Cr1.22). The apparent density of the alloys was found to decrease with Cr content from 8.32 g/cm3 for samples containing 0.5 wt%Cr to 7.26 g/cm3 for samples containing 12 wt%Cr. Therefore, the estimated porosity was found to increase from 6.4% to 16.6% with increasing Cr content from 0.5 wt% to 12 wt%. The microhardness of the samples varied from 153.6 to 284.2 VHN for the equiaxed grains and from 119.6 to 240.6 VHN for the island areas.

[1]  Maobing Shuai,et al.  Characteristics and high temperature oxidation behavior of Ni-Cr-Y2O3 nanocomposite coating prepared by cathode plasma electrolytic deposition , 2019, Journal of Alloys and Compounds.

[2]  H. Zhang,et al.  Oxidation Behavior of Ni-10Cr Alloy under the Compressive Stress at 900 ℃ , 2019, DEStech Transactions on Engineering and Technology Research.

[3]  F. A. Elrefaie,et al.  Oxidation characteristics of porous Ni-12 wt%Cr alloy at 1000 °C in air , 2018, Ain Shams Engineering Journal.

[4]  P. Olubambi,et al.  Densification, microstructure and mechanical properties of spark plasma sintered Ni-17%Cr binary alloys , 2018, The International Journal of Advanced Manufacturing Technology.

[5]  F. A. Elrefaie,et al.  Oxidation Characteristics of Porous Nickel Low-Chromium Binary Alloys in Air at 1273K for 100 h , 2018, Key Engineering Materials.

[6]  I. Wiesel,et al.  Densification , 2018, Power, Glamour and Angst.

[7]  F. A. Elrefaie,et al.  Oxidation characteristics of porous-nickel prepared by powder metallurgy and cast-nickel at 1273 K in air for total oxidation time of 100 h , 2017, Journal of advanced research.

[8]  M. Kumar,et al.  Study of mechanical properties and high temperature oxidation behavior of a novel cold-spray Ni-20Cr coating on boiler steels , 2015 .

[9]  M. Keskin,et al.  Effect of microstructural evolution and elevated temperature on the mechanical properties of Ni–Cr–Mo alloys , 2015 .

[10]  C. Alemany-Dumont,et al.  Electronic and transport properties of passive films grown on different Ni-Cr binary alloys in relation to the pitting susceptibility , 2014 .

[11]  Omayma A. Elkady,et al.  Effect of Alumina Particles Addition on Physico-Mechanical Properties of AL-Matrix Composites , 2013 .

[12]  Vasile Coman,et al.  Nickel recovery/removal from industrial wastes: A review , 2013 .

[13]  Wu Qiong,et al.  First principles calculations of alloying element diffusion coefficients in Ni using the five-frequency model , 2012 .

[14]  J. Lippold,et al.  Welding Metallurgy and Weldability of Nickel-Base Alloys , 2009 .

[15]  M. Xue.  High temperature oxidation and wear behaviour of powder metallurgically developed Ni-Cr-W-Al-Ti-MoS 2 composite , 2009 .

[16]  Yi-der Lee,et al.  Computation of Ni-Cr phase diagramvia a combined first-principles quantum mechanical and CALPHAD approach , 2006 .

[17]  M. Imam,et al.  Effect of annealing twins on Hall–Petch relation in polycrystalline materials , 2004 .

[18]  F. J. Humphreys,et al.  Recrystallization and Related Annealing Phenomena , 1995 .

[19]  P. Nash.  The Cr−Ni (Chromium-Nickel) system , 1986 .

[20]  G. Raynor,et al.  The Cr−Ni (Chromium-Nickel) system , 1981 .

[21]  M. Balasubramaniam,et al.  The effects of heat treatment and deformation on the homogenization of compacts of blended powders , 1971 .

[22]  G. Kadykova,et al.  Phase transformations in alloys of The Nb−Ti−Zr system , 1967 .

[23]  R. Swalin,et al.  Concerning an order-disorder transition in the Ni-Cr system , 1957 .

[24]  Evans,et al.  STANDARD X-RAY DIFFRACTION POWDER PATTERNS , 1962 .

[25]  Eric Starr,et al.  High Nickel Alloys Offering a Combination of High Strength and High Impact Properties , 2013 .

[26]  吴琼,et al.  First principles calculations of alloying element diffusion coefficients in Ni using the five-frequency model , 2012 .

[27]  O. Bergman.  Key Aspects of Sintering Powder Metallurgy Steel Prealloyed with Chromium and Manganese , 2011 .

[28]  F. J. Humphreys,et al.  Chapter 12 – Recrystallization Textures , 2004 .

[29]  K. Yamauchi,et al.  Volume and Grain Boundary Diffusion of Chromium in Ni-Base Ni-Cr-Fe Alloys , 2003 .