EXPLOSIVE PRODUCTION OF ULTRAFINE-GRAINED MATERIALS
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EXPLOSIVE PRODUCTION OF ULTRAFINE- EXPLOSIVE PRODUCTION OF ULTRAFINE- GRAINED MATERIALS GRAINED MATERIALS Yu. A. Gordopolov a , S. S. Batsanov a , V. A. Veretennikov a , N. G. Zaripov b , and L. V. Gordopolova a a Institute of Structural Macrokinetics and Materials Science, Chernogolovka, Moscow, 142432 Russia b State Aviation Technical University, Ufa, 450000 Russia e-mail: [email protected] Contents Contents • • Shock compression of nanopowders Shock compression of nanopowders • • Dynamic-isostatic pressing of ultrafine powders Dynamic-isostatic pressing of ultrafine powders • • Shock-induced refining of grains in materials Shock-induced refining of grains in materials • • Shock quenching of SHS products Shock quenching of SHS products • • Conclusion Conclusion
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EXPLOSIVE PRODUCTION OF ULTRAFINE-GRAINED MATERIALS. Yu. A. Gordopolov a , S. S. Batsanov a , V. A. Veretennikov a , N. G. Zaripov b , and L. V. Gordopolova a a Institute of Structural Macrokinetics and Materials Science, Chernogolovka, Moscow, 142432 Russia - PowerPoint PPT Presentation
Transcript of EXPLOSIVE PRODUCTION OF ULTRAFINE-GRAINED MATERIALS
EXPLOSIVE PRODUCTION OF ULTRAFINE-EXPLOSIVE PRODUCTION OF ULTRAFINE-GRAINED MATERIALSGRAINED MATERIALS
Yu. A. Gordopolova, S. S. Batsanova, V. A. Veretennikova, N. G. Zaripovb, and L. V. Gordopolovaa
aInstitute of Structural Macrokinetics and Materials Science, Chernogolovka, Moscow, 142432 Russia
bState Aviation Technical University, Ufa, 450000 Russia e-mail: [email protected]
ContentsContents• • Shock compression of nanopowdersShock compression of nanopowders •• Dynamic-isostatic pressing of ultrafine powdersDynamic-isostatic pressing of ultrafine powders•• Shock-induced refining of grains in materials Shock-induced refining of grains in materials •• Shock quenching of SHS productsShock quenching of SHS products• • ConclusionConclusion
SHOCK COMPRESSION OF NANOPOWDERSSHOCK COMPRESSION OF NANOPOWDERS
Pressing with cylindical geometry
ampoule(ductile metal)
ED
HE
starting powder
plug
Decaying mode (underpressing)
Regular mode(homogeneity)
Mach mode (overpressing)
P = 0 DUD = c0 + bU
PI ~ D2; PII ~ D2
PI > PII
I
D D
II
starting powder (Ni)(Ni)
mean particle size 56 nm
Resultant monolith material (Ni)Resultant monolith material (Ni)after shock compaction and thermal after shock compaction and thermal treatment (6OOtreatment (6OOC, C, 15 15 min)min)meanmean particle size < 100 nm particle size < 100 nmhardness hardness 4747 HRC HRCbending strength bending strength 1100 1100 MPaMPa
→
TEM photograph of final Ni sample
ED
KBr
HE
foil
starting powders (diamond//w-BNw-BN)
ampoule (steel)
DYNAMICDYNAMIC--ISOSTATIC PRESSING OF ULTRAFINE ISOSTATIC PRESSING OF ULTRAFINE POWDERSPOWDERS
particle size particle size ((polycryst.polycryst.)) 3-10 3-10 mm
size of single crystals in particles < size of single crystals in particles < 100 100 nmnm
final compact final compact ((diamonddiamond//w-BNw-BN))
grain size in central area grain size in central area 10 10 nmnmhardness hardness 8 8101033 HV HV
grain size at peripherygrain size at periphery 30 30 nmnmhardnesshardness ((2-32-3))10103 3 HVHV
compression strength (until cracking) compression strength (until cracking) 10 10 tt//cmcm22
→→
SHOCK-INDUCED REFINING OF GRAINS SHOCK-INDUCED REFINING OF GRAINS IN METALSIN METALS
(dynamic recrystalization)(dynamic recrystalization)
Microstructure of Al—4% Cu—0.5% Zr mixtureat different depth from the surface of loading
5 mm 7 mm
F
REFINEMENT OF CERMET GRAINS REFINEMENT OF CERMET GRAINS DURING HOT DEFORMATIONDURING HOT DEFORMATION
Experimental setupExperimental setup
rapid deformation (dynamic loading)
D
final shape of samples
initial sample (TiC0,47 SHS compact at
9500C)
slow deformation (quasi-static
loading)
= 10–4–10–3 s–1
= 0.7–0.8 ~ 106 s-1
~ 0.1
punch
force (10 ton)
EDlens
HE
metal matrix
shock wave (103m/s)
MICROSTRUCTURE OF TITANIUM CARBIDE SUBJECTED MICROSTRUCTURE OF TITANIUM CARBIDE SUBJECTED TO RAPID HOT DEFORMATION TO RAPID HOT DEFORMATION
(SHOCK COMPRESSION)(SHOCK COMPRESSION)
(a) (b)
(c) (d)
Microstructure of (a) starting TiC0.47 and (b–d) its evolution during rapid (dynamic) hot deformation (high ).
MICROSTRUCTURE OF TITANIUM CARBIDE MICROSTRUCTURE OF TITANIUM CARBIDE SUBJECTED TO SLOW HOT DEFORMATION SUBJECTED TO SLOW HOT DEFORMATION
(SUPERPLASTIC MODE)(SUPERPLASTIC MODE)
Microstructure of TiC0.6 obtained by superplastic (quasi-static) deformation of TiC0.47 (low )
CHEMICAL COMPOSITION OF TITANIUM CHEMICAL COMPOSITION OF TITANIUM CARBIDE GRAINS DURING HOT CARBIDE GRAINS DURING HOT
DEFORMATIONDEFORMATION
Lattice parameter of TiCx vs. strain for dynamic (□) and quasi-isostatic (○) loading
Latti
ce
para
met
er, Å
4.325
4.300
4.305
4.310
4.315
4.320
0 0.25 0.50 0.75 1.00 Strain , rel. units
TiC0.75
TiC0.47
TiC0.55
TiC0.58TiC0.6
4.295
4.290
FINE STRUCTURE OF TITANIUM CARBIDE FINE STRUCTURE OF TITANIUM CARBIDE DURING RAPID HOT DEFORMATIONDURING RAPID HOT DEFORMATION
(a) (b) (c)
Changes in the fine structure of TiCx during hot deformation: (a) development of intergranular sliding, formation of dislocation walls and
subgrains, (b) precipitation of tabular Ti, and (c) formation of fine-grained microduplex structure.
SHOCK QUENCHING of SHS PRODUCTSSHOCK QUENCHING of SHS PRODUCTS
Highly dense materials with controlled grain size
Detonation delay, s
80
90
100
0 120 240 360
Rel
ativ
e de
nsity
, % C/Ti = 0.47C/Ti = 0.76C/Ti = 1.00C/Ti = 1.00
ED
HE
Green mixture
Flying plate
Plug
Container
Igniter TC
0.8
0.6
1.0
1.2
0 120 240 360
Mea
n gr
ain
size
, m
C/Ti = 0.47C/Ti = 0.76C/Ti = 1.00C/Ti = 1.00
Detonation delay, s
0 50 100
GRADED AND LAYERED MATERIALS BY GRADED AND LAYERED MATERIALS BY SHOCK QUENCHING OF SHS PRODUCTSSHOCK QUENCHING OF SHS PRODUCTS
product reaction zone green mixture
Combustion wave
TiSi Ti + Si
Ti + Si
Ti + C
Cu
R/Rmax
Ti ( ), C ( ), Si ( ), Cu ( )
1.00.80.60.40.2d, m
L, m
108642
Combustion wave
TiC Cu TiSi
CONCLUSIONCONCLUSION
Action of shock waves on materials is an effective tool for modification of their structure and hence properties.
Different options for application of shock waves afford preparation of different materials with unique properties, including ultrafine-grained and nano-structured ones, for various practical implementations.
