The influence of long-lasting annealing on microstructure of AlCu4Ni2Mg2 alloy

• Autorzy: Wierzbińska, M. , Sieniawski, J.
• Języki publikacji: EN

Abstrakty

EN

Purpose: of this paper was to determine the influence of long-term annealing at elevated temperature on the microstructure and mechanical properties of AlCu4Ni2Mg2 alloy. Design/methodology/approach: The microstructure was observed using optical light (LM), scanning (SEM) and transmission (TEM) microscopy. The mechanical properties were determined on a standard tensile test machine. Findings: It was found that after long time hold at elevated temperature (523 K) the degradation of microstructure of alloy was observed. The microstructural changes consist in increase of size of hardening phases precipitates (Č’-Al2Cu) and changing its shape. These phenomena cause decrease in the mechanical properties of the alloy. Research limitations/implications: In order to complete obtained results it is recommended to perform further investigations of behaviour of AlCu4Ni2Mg2 alloy in 573 K and 623 K corresponding to the maximum values of temperature at which structural elements of piston engines made of aluminium alloys operate. Practical implications: From a practical point of view it is important to realize, that however the Cu (about 4%) and Ni (about 2%) additions significantly influence increasing of mechanical properties of aluminium alloy, nevertheless don’t protect against the degradation of its microstructure and finally from decreasing of strength during machine elements operation. Originality/value: This work has provided essential data about microstructural changes of aluminium alloy proceeding during elements of piston engines operation.

Słowa kluczowe

PL

stop metalowy; mikroskopia elektronowa; mikrostruktura; właściwości mechaniczne

EN

metallic alloy; electron microscopy; microstructure; mechanical properties

• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2009
• Tom: Vol. 34, nr 2
• Strony: 122-129
• Opis fizyczny: Bibliogr. 15 poz., rys., tabl.

Twórcy

autor

Wierzbińska, M.

autor

Sieniawski, J.

• Departament of Materials Science, Rzeszow University of Technology, ul. W. Pola 2, 35-959 Rzeszów, Poland,

Bibliografia

• [1] M. Wierzbińska, G. Mrówka-Nowotnik, Identification of phase composition of AlSi5Cu2Mg aluminium alloy in T6 condition, Archives of Materials Science and Engineering 30/2 (2008) 85-88.
• [2] J. A. Garcia-Hinojosa, C.R. Gonzalez, Y. Houbaert, Structure and properties of Al-7Si-Ni and Al-7Si-Cu cast alloys nonmodified and modified with Sr, Journal of Materials Processing Technology 143-144 (2003) 306-310.
• [3] M. Wierzbińska, J. Sieniawski, Effect of morphology of eutectic silicon crystals on mechanical properties and cleavage fracture toughness of AlSi5Cu1 alloy, Journal of Achievements in Materials and Manufacturing Engineering 14 (2006) 31-35.
• [4] L. A. Dobrzański, W. Borek, R. Maniara, Influence of the crystallization condition on Al-Si-Cu casting alloys structure Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 211-214.
• [5] G. Mrówka-Nowotnik, J. Sieniawski, M. Wierzbińska, Analysis of intermetallic particles in AlSi1MgMn aluminium alloy, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 155-158.
• [6] P. Ouellet, F. H. Samuel, Effect of Mg on the ageing behaviour of Al-Si-Cu 319 type aluminium casting alloys, Journal of Materials Science 34 (1999) 4671-4697.
• [7] G. Mrówka-Nowotnik, J. Sieniawski, M. Wierzbińska, Intermetallic phase particles in 6082 aluminium alloy, Archives of Materials Science and Engineering 28/2 (2008) 69-76.
• [8] M. Wierzbińska, J. Sieniawski, New quality assement criterion of AlSi5Cu1 alloy, Archives of Foundry Engineering 7/3 (2007) 217-221.
• [9] J. E. Hatch ed., Aluminium. Properties and physical metallurgy, ASM Metals Park, Ohio 1984.
• [10] W. F. Miao, D. E. Laughlin, Precipitation hardening in aluminium alloy 6022, Scripta Materialia 7/40 (1999) 873-878.
• [11] M. Takeda, A. Komatsu, M. Ohta, T. Shirai, T. Endo, The influence of Mn on precipitation behaviour in Al-Cu, Scripta Materialia 39 (1998) 1295-1300.
• [12] M. Warmuzek, K. Rabczak, J. Sieniawski, The course of the peritectic transformation in the Al-rich Al-Fe-Mn-Si alloys, Journal of Materials Processing Technology 162-163 (2005) 422-428.
• [13] J. P. Hirth, J. Lothe, Theory of dislocations, McGraw-Hill, New York-London 1968.
• [14] J. Weertman, J. R. Weertman, The bases of dislocation theory, PWN, Warsaw, 1969.
• [15] P. B. Hirsch, in Relation between Structure and Mechanical Properties of Metals, H.M. Stationary Office, London 1963.