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Trends in the development of high-aluminium zinc alloys of stable structure and properties

Krajewski W. K., Greer A. L., Krajewski P. K.

Archives of Metallurgy and Materials

2013

Vol. 58, iss. 3

845--847

The coposition and structural modification of high-aluminium zinc alloys influence their strenght, tribological properties and structural stability. In a series of studies, Zn - (25-26) wt.% Al - (1-2.5) wt.% Cu alloys have been doped with different levels of added Ti. The alloys’ structure and mechanical properties have been studied using: SEM (scanning electron microscopy), LM (light microscopy), Dilatometry, Pin-on-Disc wear and Strength measurements. Grain refinement leads to significant improvement of ductility in the binary Zn-25Al alloy. In the ternary alloys Zn-26Al-Cu, replacing a part of Cu with Ti allows dimensional changes to be reduced while preserving good tribological properties.

Praca poświęcona jest badaniom wpływu modyfikacji składu i struktury wysokoaluminiowych odlewanych stopów cynku na ich właściwości wytrzymałościowe, tribologiczne oraz stabilność struktury i wymiarów. W badaniach stopy Zn - (25-26) mas% Al - (1-2.5) mas.% Cu domieszkowano zmiennym dodatkiem Ti. W badaniach stosowano techniki pomiarowe SEM (scanning electron microscopy), LM (light microscopy), badania dylatometryczne, badania ścieralności Pin-on-Disc oraz badania właściwości wytrzymałościowych. Stwierdzono, iż rozdrobnienie struktury pozwala uzyskać znaczący wzrost plastyczności stopów podwójnych typu Zn-25Al, podczas gdy zastąpienie tytanem części miedzi w stopach potrójnych Zn-26Al-Cu pozwala ograniczyć zmiany wymiarowe przy zachowaniu wysokich właściwości tribologicznych.

Structural stability of the high-aluminium zinc alloys modified with Ti addition

Krajewski W. K., Zak P. L., Orava J., Greer A. L., Krajewski P. K.

Archives of Foundry Engineering

2012

Vol. 12, iss. 1

61-66

The subject of the paper is structural stability of the Zn-26 wt.% Al binary alloys doped with 2.2 wt.% Cu or 1.6 wt.% Ti addition. The structural stability of Zn-Al alloys with increased Al content is connected with stability of solid solution of zinc in aluminium [...] , which is the main component of these alloys microstructure. Such a solution undergoes phase transformations which are accompanied, among others, by changes in dimensions and strength properties. The structural stability of the ZnAL26Cu2.2 and ZnAl26Ti1.6 alloys was investigated using XRD examinations during long term natural ageing after casting, as well as during long term natural ageing after super-saturation and quenching. On the basis of the performed examinations it was stated that small Ti addition to the binary ZnAl25 alloy, apart from structure refinement, accelerates decomposition of the primary [...] phase giving stable structure in a shorter period of time in comparison with the alloy without Ti addition. Addition of Ti in amount of 1.6 wt.%, totally replacing Cu, allows obtaining stable structure and dimensions and allows avoiding structural instability caused by the metastable [...] CuZn4 phase present in the ZnAl26Cu2.2 alloy.