Phase transformations of a ZnAl based alloy containing a small amount of rare earth element

Zhu, Yao; Yan, Biao; Villaseñor, Gabriel Torres

doi:10.1016/0924-0136(94)90086-8

Cited by 7 publications

(11 citation statements)

References 2 publications

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“…It is known that the monotectoid ZnÀ Al alloys have higher strength and wear resistance than those of the eutectic and eutectoid ones [9][10][11][12]. Investigations on the monotectoid alloys have shown that additions of 2 % Cu and 2 % Si greatly improved their mechanical and tribological properties [13][14][15][16][17][18]. However, a dimensional instability problem (gradual irreversible expansion) may arise with these alloys due to the decomposition of copperrich metastable phases formed during casting to the equilibrium phases [19][20].…”

Section: Introductionmentioning

confidence: 99%

Influence of T5 heat treatment on the microstructure and lubricated wear behavior of ternary ZnAl40Cu2 and quaternary ZnAl40Cu2Si2.5 alloys

Bican¹,

Savaşkan²

2020

Materialwissenschaft Werkst

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A ternary ZnAl40Cu2 and a quaternary ZnAl40Cu2Si2.5 alloys were produced by permanent mold casting and subjected to T5 heat treatment at a temperature of 150 °C for 24 hours. The structural, mechanical and lubricated wear properties of these alloys were investigated in the as‐cast and heat‐treated conditions and the results were compared with those of SAE 65 (CuSn12) plain bearing bronze. Microstructure of the ternary alloy consisted of aluminum‐rich α, eutectoid conversion product of α+η and ϵ phase located in the interdendritic channels. In addition to these phases, silicon particles were observed in the microstructure of the quaternary alloy. T5 heat treatment caused a considerable amount of reduction in the hardness, tensile strength and wear resistance of ZnAl40‐based ternary and quaternary alloys, but improved their ductility and stability. These alloys in the as‐cast and heat‐treated conditions exhibited lower wear volume or higher wear resistance than SAE 65 bearing bronze. Among the experimental alloys, the optimum mechanical properties and wear performance were obtained from ZnAl40Cu2Si2.5 alloy in both as‐cast and heat‐treated conditions. Adhesion appeared to be the main wear mechanism for the ZnAl40‐based alloys, but abrasion dominated the wear of SAE 65 bronze.

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Section: Introductionmentioning

confidence: 99%

Influence of T5 heat treatment on the microstructure and lubricated wear behavior of ternary ZnAl40Cu2 and quaternary ZnAl40Cu2Si2.5 alloys

Bican¹,

Savaşkan²

2020

Materialwissenschaft Werkst

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“…2 " 4 ' 7 ' 8 ' 10 During the second stage of aging, the a' T phase gradually shifted by 0.2° to lower 20 angles, transforming to the af phase. This was termed the "cellular reaction."…”

Section: A Phase Transformations In Rare-earthcontaining Za-27 Alloymentioning

confidence: 99%

Influence of rare earth element additions on phase transformations in the Zn−27% Al alloy

Zhu

Goodwin

1993

J. Mater. Res.

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Rare earth additions of 3 wt. % were added to the Zn-27% Al-2% Cu-0.02% Mg alloy, known as ZA-27. The as-cast microstructure of this alloy consisted of two phases of supersaturated face-centered cubic fi' s and a' s together with a hexagonal close-packed rare-earth-containing zinc-rich phase termed E phase. The phase transformations in this alloy after aging at 100 °C and 200 °C were determined. The E phase was determined to have the lattice parameters a Q = 9.0348 A and c 0 = 13.2194 A, giving c o /a o = 1.4632. The chemical formula of the E phase was determined to be REiZnio.9Al2.9Cuo.8-The addition of 3% rare earths into ZA-27 delayed the phase transformations of this alloy. This was caused by an increase in the aluminum content of the supersaturated f3' s phase.

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“…Numerous papers on investigations of structural stability, phase transformations and their effect on the Zn-Al alloys properties include, among others, influence of Cu [4][5], RE [6][7][8] and Ti [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…In the papers [6][7] the effect of rare earth elements (RE) on the course of ageing of the alloy ZA-27 was investigated. It was determined that the addition of up to 0.3wt% of RE (mainly La, Ce and Nd ) does not influence the sequence of phase transformations observed in supersaturated alloy ZA27 without RE addition [8].…”

Section: Introductionmentioning

confidence: 99%

Structural Stability of the High-Aluminium Zinc Alloys Modified with Ti Addition

Krajewski¹,

Żak²,

Orava³

et al. 2012

Archives of Foundry Engineering

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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 α', 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 α' 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 ε−CuZn 4 phase present in the ZnAl26Cu2.2 alloy.

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Phase transformations of a ZnAl based alloy containing a small amount of rare earth element

Cited by 7 publications

References 2 publications

Influence of T5 heat treatment on the microstructure and lubricated wear behavior of ternary ZnAl40Cu2 and quaternary ZnAl40Cu2Si2.5 alloys

Influence of T5 heat treatment on the microstructure and lubricated wear behavior of ternary ZnAl40Cu2 and quaternary ZnAl40Cu2Si2.5 alloys

Influence of rare earth element additions on phase transformations in the Zn−27% Al alloy

Structural Stability of the High-Aluminium Zinc Alloys Modified with Ti Addition

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