Effect of extrusion ratios on hardness, microstructure, and crystal texture anisotropy in pure niobium tubes subjected to hydrostatic extrusion

AbstractTwo model aluminium-magnesium alloys, containing 3 and 7.5 wt.% of Mg, were subjected to plastic deformation by means of hydrostatic extrusion (HE). Two degrees of deformation were imposed by two subsequent reductions of the diameter. Microstructural analysis and tensile tests of the materials in the initial state and after deformation were performed. For both materials, HE extrusion resulted in the deformation of the microstructure—formation of the un-equilibrium grain boundaries and partition of the grains. What is more, HE resulted in a significant increase of tensile strength and decrease of the elongation, mostly after the first degree of deformation.

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Effect of severe deformation on the microstructure and properties of Nd-Fe-B powders caused by hydrostatic extrusion

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2020.167665 ◽

2021 ◽

Vol 524 ◽

pp. 167665

Author(s):

W. Kaszuwara ◽

P. Pawlik ◽

J. Zygmuntowicz ◽

B. Michalski ◽

M. Kulczyk

Keyword(s):

Hydrostatic Extrusion ◽

Microstructure And Properties ◽

Severe Deformation

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Effect of Texture and Microstructure on Tensile Behaviors in the Polycrystalline Pure Niobium

Metals and Materials International ◽

10.1007/s12540-020-00925-0 ◽

2021 ◽

Author(s):

Shanshan Zhang ◽

Yuancai Liu ◽

Tiewei Xu ◽

Mingxue Sun ◽

Qi Zhang ◽

...

Keyword(s):

Pure Niobium

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Hydrostatic extrusion of amorphous Fe82B12Si6 and U70Cr30

Physica B+C ◽

10.1016/0378-4363(86)90709-6 ◽

1986 ◽

Vol 139-140 ◽

pp. 816-818

Author(s):

John F. Lakner

Keyword(s):

Hydrostatic Extrusion

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Brillouin and Raman scattering studies of single-crystal-texture polyethylene

Macromolecules ◽

10.1021/ma00150a008 ◽

1985 ◽

Vol 18 (8) ◽

pp. 1571-1576 ◽

Cited By ~ 4

Author(s):

Paul J. Phillips ◽

Y. T. Jang ◽

Q. L. Liu ◽

Chin Hsieu Wang ◽

John F. Rabolt

Keyword(s):

Raman Scattering ◽

Single Crystal ◽

Crystal Texture

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Diffusion Niobizing of Titanium Grade 2 by Gas-Contact Method

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.669.158 ◽

2015 ◽

Vol 669 ◽

pp. 158-166

Author(s):

Dariusz Bartkowski ◽

Andrzej Mlynarczak ◽

Adam Piasecki ◽

Waldemar Matysiak ◽

Michal Hatala ◽

...

Keyword(s):

Chemical Composition ◽

Diffusion Layer ◽

Powder Mixture ◽

Diffusion Processes ◽

Contact Method ◽

Niobium Content ◽

Structure Quality ◽

Pure Niobium ◽

Titanium Grade ◽

Geometric Surface

The work presents results of diffusion niobizing of titanium Grade 2 by gas-contact method. Microhardness, thickness, chemical composition and microstructure were investigation. Diffusion processes was carried out in a two powder mixture. First consisted of ferro-niobium, kaolin and ammonium chloride, second mixture contained pure niobium instead ferro-niobium. The processes were carried out at 950°C, 1000°C and 1050°C for 2, 4 and 6 hours. Due to the geometric surface structure quality and other properties like thickness or microhardness, the best diffusion layer was obtained using first powder mixture and following parameters: temperature 950°C and time of diffusion equal 2 hours. The diffusion layer established in these conditions, had structure of niobium solution in titanium, and niobium content of about 10%. Its hardness was 550 HV0.05 while thickness was 120 μm.

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