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Purpose: To determine microstructure and hardness of hot pressed mechanically alloyed MA NiZrTiAl powders well known as a good glass formers. Design/methodology/approach: Powders has been ball milled r 40 hours starting from pure elements. Changes of particle's size and crystallographic structure of nanocrystals embedded in the amorphous matrix during milling has been determined using High Resolution Transmission Electron Microscopy HRTEM. Findings: The MA particles first grow, then decrease after 40 hours of milling, when powders possess amorphous structure. HRTEM studies of powders allowed to reveal small nanocrystals of NiTi2 within milled powders which were not detected using X-Ray diffraction. The powders show crystallization peak at temperature Tx near 553*C. Consolidation of powders was performed under vacuum using uniaxial hot pressing method at temperature slightly below Tx. Mean microhardness was determined near 430 HV and the mean Young's modulus as 81 GPa. Practical implications: It was shown a possibility of hot densification in vacuum of amorphous Ni base alloys allowing to obtain bulk amorphous compacts with embedded nanocrystals. Originality/value: The size and structure of nanmocrystals within the amorphous matrix after MA and after hot vacuum densification has been determined. The microhardness and Young's modulus of compacts show perspectives of application of such materials.
Wydawca
Rocznik
Tom
Strony
645--648
Opis fizyczny
Bibliogr. 13 poz., il., wykr.
Twórcy
autor
autor
autor
autor
autor
- Institute of Metallurgy and Materials Science of Polish Academy of Sciences, ul. W. Reymonta 25, 30-059 Kraków, Poland, nmdutkie@imim-pan.krakow.pl
Bibliografia
- [1] T. G. Park, S. Yi, D. H. Kim, Development of new Ni-based amorphous alloys containing no metaloid that have large undercooled liquid regions, Scripta Materialia 43 (2000) 109-114.
- [2] T. Poloczek, S. Griner, R. Nowosielski, Crystallization Process of Ni base Metallic Glasses, Archives of Matererials Science and Engineering 28/6 (2007) 353-356.
- [3] R. Akatsuka, T. Zhang, H. Koshiba, A. Inoue, Preparation of new Ni-based amorphous alloys with supercooled liquid region, Material Transition, JIM 40 (1999) 258-264.
- [4] X. M. Wang, I. Yoshii, A. Inoue, Y. H. Kim, I. B. Kim, Bulk amorphous Ni75-xNb5MxP20-aBy(M=Cr,Mo) alloys with large supercooling and high strength, Material Transistion JIM 40 (1999) 1130-1136.
- [5] A. Inoue, Stabilization of supercooled liquid and opening-up of bulk glassy alloys, Proceedings of Japan Academii B 73,1997, 19-24.
- [6] T. D. Shen, R. B. Schwartz, Synthesis, structure and properties of iron-based bulk glass-forming metallic alloys prepared by different processing, Applied Physical Letters 75 (1999) 49-56.
- [7] Jinduo Fan, Yiqun Gaob, Changyi Hub, Ming Xie, Crystallization behavior of Ti45:50Zr23:89Ni15:91Cu14:70 metallic glass, Materials Science and Engineering A304-306 (2001) 367-370.
- [8] C. K. Lin, S. W. Liu, P. Y. Lee, Mg-Y-Cu bulk metallic glass obtained by mechanical alloying and powder consolidation, Metal Material Transistion A32 (2001) 1777-1780.
- [9] J. Dutkiewicz, L. Lityńska, M. Parra Carrillo, I. Mercioniu, L. Jaworska, Metallic glass formation in NiTiZrNbSi alloys by rapid solidification or ball milling and ultra high pressure compaction, Journal of Non-Crystalline Solids (in Print).
- [10] P. Y. Lee, C. K. Lin, I. K. Jeng, C. C. Wang, G. S. Chen, Characterization of Ni57Zr20Ti18Al5 amorphous powder obtained by mechanical alloying, Materials Chemistry and Physics 84 (2004) 358-362.
- [11] J. Dutkiewicz, W. Maziarz, R. Kocisko, T. Czeppe, J. Kuśnierz, L. Lityńska, Massive amorphous CuZrTiAg alloy processed by ball milling and hot pressing, Material Science 157-158 (2007) 146-149.
- [12] J. Dutkiewicz, L. Jaworska, W. Maziarz, T. Czeppe, M. Lejkowska, A. Kubíček, M. Pastrňák, Consolidation of amorphous ball milled Zr-Cu-Al and Zr-Ni-Ti-Cu powders, Journal of Alloys Compounds 434-435 (2007) 333-335.
- [13] M. Sherif El-Eskandarany, M. Matsushita, A. Inoue, Mechanically driven solid state amorphization reaction of ball-milled Nb50Zr10Al10Ni10Cu20 powders and the effect of annealing Journal of Non-Crystalline Solids 312-314 (2002) 622-627.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWAN-0002-0015