Structural phase transformations study of brittle refractory metals - - PowerPoint PPT Presentation

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Structural phase transformations study of brittle refractory metals - - PowerPoint PPT Presentation

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SFR-2016 Structural phase transformations study of brittle refractory metals and intermetallics with L1 2 structure using synchrotron radiation PILYUGIN, Vitaliy SOLOVEVA, Yulia ANCHAROV, Alexey STARENCHENKO, Vladimir STARENCHENKO,

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SLIDE 1

Structural phase transformations study

  • f brittle refractory metals and

intermetallics with L12 structure using synchrotron radiation

PILYUGIN, Vitaliy SOLOV’EVA, Yulia ANCHAROV, Alexey STARENCHENKO, Vladimir STARENCHENKO, Svetlana TOLMACHEV, Timofey M.N. Mikheev Institute of Metal Physics of the Ural Branch

  • f the Russian Academy of Sciences (IMP UB RAS)

Tomsk State University of Architecture and Building Institute of Solid State Chemistry and Mechanochemistry SB RAS

SFR-2016

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Aims, materials and methods

Study of microstructure and phase state: intermetallic Ni3Ge, with anomalous properties, transitional 3d-4d metals (Fe, Ti, Zr), including refractory fragile (Mo, Ir, Re) after deformation under high pressure (HPT) SR, NGR, TEM, SEM, metalography, mechanical tests

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SLIDE 3

SCSTR Budker INP SB RAS Diffractometry in hard X-rays λ=0.3686 A°

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SLIDE 4

HPT in Bridgman anvils - shear under pressure. Ag in situ under pressure 12 GPa between c-NB, SR, λ=0.3686 A°

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SLIDE 5

The microstructure of superalloys with intermetallic phase (Ni3Ge, Ni3Al, Ni3Fe)

фаза

/

γ

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SLIDE 6

Alloys with anomalous temperature dependence of the flow stresses: Ni3Ge, Ni3Al, Ni3Fe, Ni3W

400 800 1200 40 80 400 800 1200 40 80 120

σ

0,2%, 10 МПа

σ

0,2%, 10 МПа

á)

T, K

Ni3Al Ni3(Al,W)

à)

  • B
  • A
  • D
  • C
  • E

А

B

C D E А B C

Ni3Ge

â)

  • C
  • B
  • A

Ni3Ga

ã)

б)

  • 200

200 400 600 800 4 8 12 16 20

Ni3Ga Ni3Ge

335 114 Ni3Ge Ni3Ga

t,

0C

τ, 10MПа

2 4 6 Ni3(Al,Ti) 132

σ

0,2%, 100 МПа

5 4 3 2 1 σ

0,2%, 100 МПа

2 4 6 8 Ni3Al 8 10-2мм/с 7,8 10-5мм/с

a) в)

The data of different authors SFR-2016 SFR-2016

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SLIDE 7

Superstructure L12

FCC - lattice  – А atoms – В atoms

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SLIDE 8

6 0, T T

пл

>

0,0 0,1 0,2 0,3 2 4 6 τ,10

2 МПа

77K 293K 423K 523K 673K 873K 973K

ε

200 400 600 800 1000 20 40 T, K τ0, 10МПа

1mm 1mm

Plastic deformation superlocalization

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SLIDE 9

[0 0 1] Т=923К, ε≈13%

×45 ×140 ×400 ×900 ×900

Plastic deformation superlocalization

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SLIDE 10
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SLIDE 11

Т=973К, ε≈9% (SCAN)

×45 ×300 ×1200 ×1200 [1 3 9]

Plastic deformation superlocalization

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SLIDE 12

Single crystal: (001) (031) (301) Polycrystalline

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SLIDE 13

Phase transitions

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SLIDE 14

Fe phase diagram

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SLIDE 15

λ = 0,368 °A: Anvils c- NB; Fe: с-NB + ε-phase, P=14 GPа

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SLIDE 16

Mössbauer spectra of strained iron under pressure. Left: CG

  • sample. a – initial state b – 14.5 GPa, 45 % hcp; c – 16 GPa, 70

% hcp. Right: NC sample. a – initial state of the sample outside

  • f anvils; b – 8.0 GPa 0 % hcp ; c – 16.8 GPa 11 % hcp; d –

18.5 GPa 48 % hcp; e – 19.5 GPa 72 % hcp

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SLIDE 17

HYSTERESIS OF α-ε TRANSITION IN IRON In situ data NGR and SR ∆H = 4 ГПа

е0.5 Н, ГПа 1 2 3 4 5 6 1 2 3 4

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SLIDE 18

Ti

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SLIDE 19
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SLIDE 20

Ti

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SLIDE 21

The mechanical properties of refractory 4d-metals

B, GPa G, GPa µ σВ, MPa δ,% Ψ,% Hµ,GPa

W

350-400 125-155 0.3 1000 0.6% 0% 3.480-3.800

Ir

520-590 199-266 0.28 490 6-10% (70% м/к) 10-15% 1.960-2.350

Ta

190 70 0.35 204 30% 75% 2.310

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SLIDE 22

Products made of iridium

Iridium cr cruci cibles es of d differ eren ent shapes es, wire re, rolled, t tube bes, ing ngotshi high-proce cessed m met etal, massive single c crystals (Ekaterinbu nburg pl plant nt ) Cont ntaine ner of pl plutoni nium o

  • xide

allo lloy I Ir-0. 0.3% 3% W f for ther ermoel elect ectric g c gen ener erator, Galileo, 1989

Franko-Ferreira E.A., Goodwin G.M., George T.G., Rinehart G.H. Long life radioisotopic sources encapsulated in platinum metal alloys. Platinum Metals Rev.-1997.-vol. 41, No 4, pp. 154 – 163 (Окриджская национальная лаборатория, США)

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SLIDE 23
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SLIDE 24

Ir, HPT ε≥5, 14 GPa

Nanostructure of iridium

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SLIDE 25

Ta diffraction patterns in SR

MAR RESEARCH 3450

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SLIDE 26

Ta texture after HPT

(200) (110)

Initial

n=1 n=5

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SLIDE 27

THANK YOU!