TY  - JOUR
AU  - Ristić, Slavica S.
AU  - Polić, Suzana R.
AU  - Radojković, Bojana
AU  - Linić, Suzana
AU  - Bikić, Vesna
AU  - Jegdić, Bore
AU  - Pavlović, Miloš
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2280
AB  - The paper presents the results of laser cleaning of corrosive and other deposits on a metal archaeological artefact from the Danube. Nd: YAG laser, energy up to 750 mJ and wavelengths λ = 1064 nm and 532 nm is used. The cleaning efficiency was examined in the function of laser energy, wavelength, and number of pulses, i.e. the time of exposure and moist of the surface of the sample. The results of removal of unwanted layers from the surface of the artefact and morphological changes on the base material were examined by optical and scanning electronic microscopy (OM and SEM). Micro-chemical changes have been determined by energy dispersive X-ray analysis (EDX) and x-ray fluorescence spectrometry (XRF). It has been shown that λ = 532 nm has higher efficiency for cleaning this sample and that the surface moisture has very small influence on laser cleaning efficiency. Research carried out on the archaeological object from the Danube shows that the application of lasers in the cleaning of undesirable layers is very efficient, safe and environmentally friendly.
AB  - U radu su prikazani rezultati laserskog čišćenja korozivnih i drugih naslaga na metalnom arheološkom predmetu koji je nađen u Dunavu. Korišćen je Nd:YAG laser, energije do 750mJ i talasne dužine λ=1064nm i 532nm. Efikasnost čišćenja je ispitivana u funkciji energije lasera, talasne dužine, broja impulsa, odnosno vremena eksponiranja i vlažnosti površine uzorka. Rezultati skidanja nepoželjnih slojeva sa površine uzorka, kao i morfoloških promena na osnovnom materijalu, ispitivani su optičkom i skenirajućom elektronskom mikroskopijom ( OM i SEM), a ispitivanje mikrohemijskih promena izvršeno je pomoću energijske disperzione spektrometrijske analize (EDX) i rendgensko fluorescentnom spektroskopijom (XRF). Pokazano je da za čišćenje ovog uzorka veću efikasnost ima λ= 532nm i da je uticaj vlažnosti površine na efikasnost laserskog čišćenja veoma mali. Istraživanja obavljena na arheološkom uzorku iz Dunava, pokazuju da je primena lasera u čišćenju nepoželjnih slojeva veoma efikasna, bezbedna i ekološki prihvatljiva.
PB  - Belgrade, Serbia : Engineering Society for Corrosion
T2  - Zaštita materijala
T1  - Laser cleaning of the archaeological metal sample from the Danube
T1  - Istraživanje mogućnosti primene lasera u čišćenju arheoloških metalnih predmeta
VL  - 59
IS  - 3
SP  - 410
EP  - 421
DO  - 10.5937/zasmat1803410R
ER  - 

@article{
author = "Ristić, Slavica S. and Polić, Suzana R. and Radojković, Bojana and Linić, Suzana and Bikić, Vesna and Jegdić, Bore and Pavlović, Miloš",
year = "2018",
abstract = "The paper presents the results of laser cleaning of corrosive and other deposits on a metal archaeological artefact from the Danube. Nd: YAG laser, energy up to 750 mJ and wavelengths λ = 1064 nm and 532 nm is used. The cleaning efficiency was examined in the function of laser energy, wavelength, and number of pulses, i.e. the time of exposure and moist of the surface of the sample. The results of removal of unwanted layers from the surface of the artefact and morphological changes on the base material were examined by optical and scanning electronic microscopy (OM and SEM). Micro-chemical changes have been determined by energy dispersive X-ray analysis (EDX) and x-ray fluorescence spectrometry (XRF). It has been shown that λ = 532 nm has higher efficiency for cleaning this sample and that the surface moisture has very small influence on laser cleaning efficiency. Research carried out on the archaeological object from the Danube shows that the application of lasers in the cleaning of undesirable layers is very efficient, safe and environmentally friendly., U radu su prikazani rezultati laserskog čišćenja korozivnih i drugih naslaga na metalnom arheološkom predmetu koji je nađen u Dunavu. Korišćen je Nd:YAG laser, energije do 750mJ i talasne dužine λ=1064nm i 532nm. Efikasnost čišćenja je ispitivana u funkciji energije lasera, talasne dužine, broja impulsa, odnosno vremena eksponiranja i vlažnosti površine uzorka. Rezultati skidanja nepoželjnih slojeva sa površine uzorka, kao i morfoloških promena na osnovnom materijalu, ispitivani su optičkom i skenirajućom elektronskom mikroskopijom ( OM i SEM), a ispitivanje mikrohemijskih promena izvršeno je pomoću energijske disperzione spektrometrijske analize (EDX) i rendgensko fluorescentnom spektroskopijom (XRF). Pokazano je da za čišćenje ovog uzorka veću efikasnost ima λ= 532nm i da je uticaj vlažnosti površine na efikasnost laserskog čišćenja veoma mali. Istraživanja obavljena na arheološkom uzorku iz Dunava, pokazuju da je primena lasera u čišćenju nepoželjnih slojeva veoma efikasna, bezbedna i ekološki prihvatljiva.",
publisher = "Belgrade, Serbia : Engineering Society for Corrosion",
journal = "Zaštita materijala",
title = "Laser cleaning of the archaeological metal sample from the Danube, Istraživanje mogućnosti primene lasera u čišćenju arheoloških metalnih predmeta",
volume = "59",
number = "3",
pages = "410-421",
doi = "10.5937/zasmat1803410R"
}

Ristić, S. S., Polić, S. R., Radojković, B., Linić, S., Bikić, V., Jegdić, B.,& Pavlović, M.. (2018). Laser cleaning of the archaeological metal sample from the Danube. in Zaštita materijala
Belgrade, Serbia : Engineering Society for Corrosion., 59(3), 410-421.
https://doi.org/10.5937/zasmat1803410R

Ristić SS, Polić SR, Radojković B, Linić S, Bikić V, Jegdić B, Pavlović M. Laser cleaning of the archaeological metal sample from the Danube. in Zaštita materijala. 2018;59(3):410-421.
doi:10.5937/zasmat1803410R .

Ristić, Slavica S., Polić, Suzana R., Radojković, Bojana, Linić, Suzana, Bikić, Vesna, Jegdić, Bore, Pavlović, Miloš, "Laser cleaning of the archaeological metal sample from the Danube" in Zaštita materijala, 59, no. 3 (2018):410-421,
https://doi.org/10.5937/zasmat1803410R . .

TY  - JOUR
AU  - Jegdić, Bore
AU  - Bobić, Biljana
AU  - Pavlović, Miloš K.
AU  - Alil, Ana
AU  - Putić, Slaviša S.
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1734
AB  - The effect of one-step and a new (short) two-step aging process on the resistance to stress corrosion cracking of an aluminum alloy 7000 series was investigated, using slow strain rate test and fracture mechanics method. The aging level in the tested alloy was evaluated by means of scanning electron microscopy and measurements of electrical resistivity. It was shown that the alloy after the new two-step aging is significantly more resistant to stress corrosion cracking. Values of tensile properties and fracture toughness are similar for both thermal states. Processes that take place at the crack tip have been considered. The effect of the testing solution temperature on the crack growth rate on the plateau was determined. Two values of the apparent activation energy were obtained. These values correspond to different processes that control crack growth rate on the plateau at higher and lower temperatures.
AB  - Ispitivan je uticaj jednostepenog i novog (kratkotrajnog) dvostepenog termičkog taloženja na otpornost prema naponskoj koroziji aluminijumske legure serije 7000, primenom metode male brzine deformacije i metode mehanike loma. Stepen starenja ispitivane legure je procenjen primenom skening elektronske mikroskopije i na osnovu merenja električne otpornosti. Pokazano je da je legura posle novog dvostepenog termičkog starenja znatno otpornija prema naponskoj koroziji. Vrednosti zateznih karakteristika i žilavosti loma su slične za oba termička stanja legure. Razmatrani su procesi koji se odvijaju na vrhu naponsko-korozione prsline. Određen je uticaj temperature rastvora za ispitivanje na brzinu rasta prsline na platou. Određene su dve vrednosti prividne energije aktivacije. Ove vrednosti odgovaraju različitim procesima koji kontrolišu brzinu rasta prsline na platou, na visokim i niskim temperaturama.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Stress corrosion cracking resistance of aluminum alloy 7000 series after two-step aging
T1  - Otpornost aluminijumske legure serije 7000 prema naponskoj koroziji posle dvostepenog termičkog taloženja
VL  - 21
IS  - 2
SP  - 261
EP  - 268
DO  - 10.2298/CICEQ140324024J
ER  - 

@article{
author = "Jegdić, Bore and Bobić, Biljana and Pavlović, Miloš K. and Alil, Ana and Putić, Slaviša S.",
year = "2015",
abstract = "The effect of one-step and a new (short) two-step aging process on the resistance to stress corrosion cracking of an aluminum alloy 7000 series was investigated, using slow strain rate test and fracture mechanics method. The aging level in the tested alloy was evaluated by means of scanning electron microscopy and measurements of electrical resistivity. It was shown that the alloy after the new two-step aging is significantly more resistant to stress corrosion cracking. Values of tensile properties and fracture toughness are similar for both thermal states. Processes that take place at the crack tip have been considered. The effect of the testing solution temperature on the crack growth rate on the plateau was determined. Two values of the apparent activation energy were obtained. These values correspond to different processes that control crack growth rate on the plateau at higher and lower temperatures., Ispitivan je uticaj jednostepenog i novog (kratkotrajnog) dvostepenog termičkog taloženja na otpornost prema naponskoj koroziji aluminijumske legure serije 7000, primenom metode male brzine deformacije i metode mehanike loma. Stepen starenja ispitivane legure je procenjen primenom skening elektronske mikroskopije i na osnovu merenja električne otpornosti. Pokazano je da je legura posle novog dvostepenog termičkog starenja znatno otpornija prema naponskoj koroziji. Vrednosti zateznih karakteristika i žilavosti loma su slične za oba termička stanja legure. Razmatrani su procesi koji se odvijaju na vrhu naponsko-korozione prsline. Određen je uticaj temperature rastvora za ispitivanje na brzinu rasta prsline na platou. Određene su dve vrednosti prividne energije aktivacije. Ove vrednosti odgovaraju različitim procesima koji kontrolišu brzinu rasta prsline na platou, na visokim i niskim temperaturama.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Stress corrosion cracking resistance of aluminum alloy 7000 series after two-step aging, Otpornost aluminijumske legure serije 7000 prema naponskoj koroziji posle dvostepenog termičkog taloženja",
volume = "21",
number = "2",
pages = "261-268",
doi = "10.2298/CICEQ140324024J"
}

Jegdić, B., Bobić, B., Pavlović, M. K., Alil, A.,& Putić, S. S.. (2015). Stress corrosion cracking resistance of aluminum alloy 7000 series after two-step aging. in Chemical Industry and Chemical Engineering Quarterly / CICEQ
Association of the Chemical Engineers of Serbia., 21(2), 261-268.
https://doi.org/10.2298/CICEQ140324024J

Jegdić B, Bobić B, Pavlović MK, Alil A, Putić SS. Stress corrosion cracking resistance of aluminum alloy 7000 series after two-step aging. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2015;21(2):261-268.
doi:10.2298/CICEQ140324024J .

Jegdić, Bore, Bobić, Biljana, Pavlović, Miloš K., Alil, Ana, Putić, Slaviša S., "Stress corrosion cracking resistance of aluminum alloy 7000 series after two-step aging" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 21, no. 2 (2015):261-268,
https://doi.org/10.2298/CICEQ140324024J . .