Modification of the D16 aluminum alloy structure by pulsed relativistic electron beam
The influence of a pulsed intense relativistic electron beam on mesoscopic structural characteristics of D16 aluminium alloy plates is studied. The phenomenological parameters of superplastic flow of alloy D16 plates after irradiation is determined and compared with those before irradiation. The pos...
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2001
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| Cite this: | Modification of the D16 aluminum alloy structure by pulsed relativistic electron beam / V.F. Klepikov, V.T. Uvarov, V.F. Kivshyk, А.G. Ponomarev, М.I. Bazaleev, V.V. Bryukhovetsky, R.I. Kuznetsova, V.V. Lytvynenko // Вопросы атомной науки и техники. — 2001. — № 3. — С. 187-188. — Бібліогр.: 5 назв. — англ. |
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nasplib_isofts_kiev_ua-123456789-792712025-02-09T20:21:29Z Modification of the D16 aluminum alloy structure by pulsed relativistic electron beam Модификация структуры алюминиевого сплава Д16 импульсным релятивистским пучком электронов Klepikov, V.F. Uvarov, V.T. Kivshyk, V.F. Ponomarev, A.G. Bazaleev, М.I. Bryukhovetsky, V.V. Kuznetsova, R.I. Lytvynenko, V.V. The influence of a pulsed intense relativistic electron beam on mesoscopic structural characteristics of D16 aluminium alloy plates is studied. The phenomenological parameters of superplastic flow of alloy D16 plates after irradiation is determined and compared with those before irradiation. The possible causes of improvement in superplastic flow parameters of irradiated material are analyzed. 2001 Article Modification of the D16 aluminum alloy structure by pulsed relativistic electron beam / V.F. Klepikov, V.T. Uvarov, V.F. Kivshyk, А.G. Ponomarev, М.I. Bazaleev, V.V. Bryukhovetsky, R.I. Kuznetsova, V.V. Lytvynenko // Вопросы атомной науки и техники. — 2001. — № 3. — С. 187-188. — Бібліогр.: 5 назв. — англ. 1562-6016 PACS numbers: 62.20.Fe, 62.20.Hg, 41.85 https://nasplib.isofts.kiev.ua/handle/123456789/79271 en Вопросы атомной науки и техники application/pdf Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
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The influence of a pulsed intense relativistic electron beam on mesoscopic structural characteristics of D16 aluminium alloy plates is studied. The phenomenological parameters of superplastic flow of alloy D16 plates after irradiation is determined and compared with those before irradiation. The possible causes of improvement in superplastic flow parameters of irradiated material are analyzed. |
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Article |
| author |
Klepikov, V.F. Uvarov, V.T. Kivshyk, V.F. Ponomarev, A.G. Bazaleev, М.I. Bryukhovetsky, V.V. Kuznetsova, R.I. Lytvynenko, V.V. |
| spellingShingle |
Klepikov, V.F. Uvarov, V.T. Kivshyk, V.F. Ponomarev, A.G. Bazaleev, М.I. Bryukhovetsky, V.V. Kuznetsova, R.I. Lytvynenko, V.V. Modification of the D16 aluminum alloy structure by pulsed relativistic electron beam Вопросы атомной науки и техники |
| author_facet |
Klepikov, V.F. Uvarov, V.T. Kivshyk, V.F. Ponomarev, A.G. Bazaleev, М.I. Bryukhovetsky, V.V. Kuznetsova, R.I. Lytvynenko, V.V. |
| author_sort |
Klepikov, V.F. |
| title |
Modification of the D16 aluminum alloy structure by pulsed relativistic electron beam |
| title_short |
Modification of the D16 aluminum alloy structure by pulsed relativistic electron beam |
| title_full |
Modification of the D16 aluminum alloy structure by pulsed relativistic electron beam |
| title_fullStr |
Modification of the D16 aluminum alloy structure by pulsed relativistic electron beam |
| title_full_unstemmed |
Modification of the D16 aluminum alloy structure by pulsed relativistic electron beam |
| title_sort |
modification of the d16 aluminum alloy structure by pulsed relativistic electron beam |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| publishDate |
2001 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/79271 |
| citation_txt |
Modification of the D16 aluminum alloy structure by pulsed relativistic electron beam / V.F. Klepikov, V.T. Uvarov, V.F. Kivshyk, А.G. Ponomarev, М.I. Bazaleev, V.V. Bryukhovetsky, R.I. Kuznetsova, V.V. Lytvynenko // Вопросы атомной науки и техники. — 2001. — № 3. — С. 187-188. — Бібліогр.: 5 назв. — англ. |
| series |
Вопросы атомной науки и техники |
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| fulltext |
MODIFICATION OF THE D16 ALUMINUM ALLOY STRUCTURE
BY PULSED RELATIVISTIC ELECTRON BEAM
V.F. Klepikov1), V.T. Uvarov2), V.F. Kivshyk1), А.G. Ponomarev2), М.I. Bazaleev1),
V.V. Bryukhovetsky1), R.I. Kuznetsova1), V.V. Lytvynenko1)
1)Scientific and Technological Center of Electrophysics, NAS of Ukraine
28 Chernyshevskyi Str., P.O.BOX 8812, UA-61002 Kharkiv, Ukraine
tel.: (0572) 404720 ,fax: (0572) 475261, e-mail: ipct@pem.kharkov.ua
2)NSC KIPT, Kharkiv, Ukraine
The influence of a pulsed intense relativistic electron beam on mesoscopic structural characteristics of D16 alumini-
um alloy plates is studied. The phenomenological parameters of superplastic flow of alloy D16 plates after irradia-
tion is determined and compared with those before irradiation. The possible causes of improvement in superplastic
flow parameters of irradiated material are analyzed.
PACS numbers: 62.20.Fe, 62.20.Hg, 41.85
1 INTRODUCTION
Many methods of metallic material structure modifi-
cation are known, in particular, explosion processing,
temperature hardening, ennobling melting down with an
electron beam. High-current electron beam processing
of a material allows to simulate all the above-mentioned
methods due to the fact that when local beam energy
concentrations are higher then 107 J/cm2 the pressure in
the target reaches the value of several megabars [1, 2].
Because the maximum of beam energy absorption is
reached on the target surface, the surface microexplo-
sion takes place which is accompanied with a shock-
plastic wave in the target due to heat exchange. The ef-
fects mentioned were the base for studying the structural
characteristics and mechanical properties of aluminium
alloy plates exposed to pulsed high-current relativistic
electron beam.
2 MATERIALS AND METHODS OF EXPER-
IMENT
Initial plates of D16 aluminum alloy (4.8% Cu;
1.5% Mg; 0.8% Mn; impurities of Fe and Si<0.5%; Al
based) with the thickness 3 mm were cut out from the
massive ingot of the industrial semi-finished product
and irradiated from both sides with a high-current
pulsed beam of relativistic electrons with the energy
density 109 W/cm2 (beam energy bE ≈0.5 MeV, current
bI ≈4 kA, pulse duration pτ ≈5·10-6 sec). The plate was
exposed to action of one pulse from each side. Mi-
crostructure was analyzed with the help of the light mi-
croscopy, using the quantitative metallography standard
methods.
Mechanical tests of samples with the length of a
working part 10 mm and the width 4 mm were made by
tensile straining on air with a constant active flow strain.
The time of sample heating up to the test temperature
was less then 25 min. The temperature was supported
constant with a precision of ±2°. Irradiated and unirradi-
ated samples were tested, results were compared.
3 RESULTS AND DISSCUSSION
The initial grained structure of the alloy used is
shown in Fig. 1,a. One can see that it is rather coarse-
grained, nonuniaxial and heterograined. The structure of
the alloy after irradiation is shown in Fig. 1,b. It is ultra-
fine-grained and uniaxial. The average size of the grain
is 2-3 µm. Such a structure is observed at the whole
depth of the plate except a small surface layer. The ori-
gin of this structure is caused by a complex effect of
electron beam action: temperature, radiation and shock-
ing. Intensive heating leads to melting the surface layer
of the plate. The surface of the plate is shown in
Fig. 2,a. The same surface in polarized light is shown in
Fig. 2,b. Such a view of the surface in polarized light is
the result of residual stress presence in the smelted layer
of the plate. The structure of the surface layer is rather
coarse- grained (near 40 µm). Therefore the surface of
irradiated samples was grind off for 0.05-0.1 mm from
each side before mechanical testing.
Besides of radiation defects from direct interaction
of electrons with the plate, the electron beam braking is
accompanied by generation of X-rays, that is an addi-
tional cause of formation of radiation defects on whole
plate’s depth.
It is known that the effect of dispersion of surface
layer precipitates plays a basic role under irradiation
with electrons. Substance dissolved as a result of irradi-
ation can precipitate again from the solution in the
neighborhood of the parent particle. Although the elec-
tron energy (0.5 MeV) is yet insufficient for atom
knocking out from the lattice points, nevertheless the
beam intensity leading to melting the plate surface and
creating the blast wave, can result in breaking and dis-
persion of coarse inclusions. Thus preliminary irradia-
tion of the alloy D16 plates makes it possible to reduce
dispersoids and decrease the size of coarse inclusions.
Mechanical tests were conducted in the temperature
range T=713-183K. The largest elongation at rupture
was demonstrated by samples (irradiated and unirradiat-
ed) which were deformed at T=773K. The elongation at
rupture δ as a function of the applied yield stress σ for
unirradiated samples is demonstrated in Fig. 3 (line 1).
One can see that samples showed a rather low values of
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 2001. №3.
Серия: Ядерно-физические исследования (38), с. 187-188.
187
elongation at rupture. Dependence of δ on σ has a maxi-
mum, when σ=3.0 MPa (δ=72%). Dependence of δ on
σ for irradiated samples is shown in Fig. 3 (line 2). One
can see that for the low strains the value δ is larger for
irradiated samples. The maximum of δ, as for unirradi-
ated samples, is realized when σ=3.0 MPa (δ=133%).
Fig. 1. Microstructure of D16 alloy: a) initial; b) af-
ter irradiation.
а
b
40 µm
Fig. 2. View of the surface of irradiated alloy D16
plate: a) in ordinary light; b) in polarized light.
Although unirradiated samples have the elongation
at rupture almost in 2 times less then irradiated ones,
nevertheless one and another have phenomenological
parameters peculiar to superplastic materials. There-
fore, probably, grain boundaries are in a nonequili-
breium state, typical for superplasticity, that makes pos-
sible their intensive creeping. However, the cause of a
quick breaking of deformed samples probably is the ex-
istence of coarse inclusions of undissolving phases. Irra-
diation, apparently, makes it possible to decrease a size
of inclusions and increase δ.
Fig. 3. δ versus σ for D16 alloy. 1 - without irradia-
tion; 2 - with irradiation.
4 CONCLUSION
1. Irradiation of the alloy D16 plates with a pulsed rel-
ativistic electron beam leads to formation in them
the ultrafine-grained and uniaxial structure.
2. Parameters of superplastic flow of irradiated sam-
ples are better then these of unirradiated ones. This
is probably related with distinction in grains and re-
distribution of consolidating phase particles.
REFERENCES
1. О.V.Bogdancevich, A.A.Rukhadze. Possibility to
create a high pressure in solid using a high-current
electron gun // Pis’ma v Zhournal Ehksperimen-
tal’noj i Teoreticheskoj Fiziki. 1971, v. 13, N. 9,
p. 517-519 (in Russian).
2. B.A.Demidov, M.V.Ivkin, V.A.Petrov, V.S.Uglov,
V.D.Chedgemov. Excitation of shock waves in
thick target using the high-current REP // Zhurnal
Tekhnicheskoj Fiziki. 1980, v. 50, N. 10,
p. 2205-2208. (in Russian)
3. E.S.Machurin. Radiation-thermal technological
processes of metal processing // Voprosy atomnoj
nauki i tekhniki. Sr.: Radiatsionnaya tekhnika (31).
1985, v. 3, p. 99-103. (in Russian)
4. L.N.Larikov. Radiation effect on phase transforma-
tions // Voprosy atomnoj nauki i tekhniki. Ser.:
"Fizika radiatsionykh povrezhdenij i radiatsionnoe
materialovedenie" (17). 1981, v. 3, p. 32-43. (in
Russian).
5. Superplastic Forming of Structural Alloys / Еd. by
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nia: The Metallurgical Society of AIME, 1982.
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