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Research Papers

Zamak 2 Alloy Produced by Mechanical Alloying and Consolidated by Sintering and Hot Pressing

[+] Author and Article Information
Flávia Costa da Silva

CAPES Foundation,
Ministry of Education of Brazil,
Brasília DF 70040-020, Brazil;
Department of Mechanical Engineering,
Universidade do Estado de Santa Catarina,
Rua Paulo Malschitzki 200,
Joinville 89219-710, Santa Catarina, Brazil
e-mail: flavia.costa@outlook.com

Kamila Kazmierczak

CAPES Foundation,
Ministry of Education of Brazil,
Brasília DF 70040-020, Brazil
e-mail: kamilakaz@hotmail.com

César Edil da Costa

Department of Mechanical Engineering,
Universidade do Estado de Santa Catarina,
Rua Paulo Malschitzki 200,
Joinville 89219-710, Santa Catarina, Brazil
e-mail: cesar.edil@udesc.br

Júlio César Giubilei Milan

Department of Mechanical Engineering,
Universidade do Estado de Santa Catarina,
Rua Paulo Malschitzki 200,
Joinville 89219-710, Santa Catarina, Brazil
e-mail: julio.milan@udesc.br

José Manuel Torralba

Department of Materials Science and
Engineering,
Universidad Carlos III Madrid,
Avda. de la Universidad 30,
Leganés 28911, Madrid, Spain
e-mail: josemanuel.torralba@imdea.org

Manuscript received October 27, 2016; final manuscript received June 25, 2017; published online July 17, 2017. Assoc. Editor: Donggang Yao.

J. Manuf. Sci. Eng 139(9), 091011 (Jul 17, 2017) (7 pages) Paper No: MANU-16-1573; doi: 10.1115/1.4037181 History: Received October 27, 2016; Revised June 25, 2017

The Zamak 2 alloy has the best mechanical properties of the Zamak alloys with respect to the tensile strength, creep resistance, and hardness. Zamak 2 is a commercial material widely used for the manufacturing of mechanical components. The presence of Cu in this alloy (3 wt. %) improves the mechanical properties through the formation of E (CuZn4) precipitates. The powder metallurgy (P/M) has an important direct advantage in the fabricated parts with respect to the finished dimensions or near net shaping due to the additional phase stabilization without heat treatment. However, there are few studies into the production of this zinc alloy via mechanical alloying and the effect of the consolidation technique in terms of the material properties; these research deficiencies led to the development of this work. The powder was analyzed during milling until achieving a steady-state, which occurred after 30 h of milling in a planetary ball mill at 400 rpm. The high-energy milling produces a Zamak 2 alloy powder with a T′ stable phase and with a greater melting point. When consolidated using hot pressing, the hardness increases compared to sintering and casting alloy.

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References

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Figures

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Fig. 1

X-ray patterns for Zamak 2 powder during high energy milling

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Fig. 2

Morphology evolution of the Zamak 2 powder during milling process in: (a) 0 h, (b) 10 h, (c) 20 h, and (d) 30 h

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Fig. 3

Microstructure of the cross section of Zamak 2 powder during milling at (a) 10 h, (b) 20 h, and (c) 30 h

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Fig. 4

Particle size distribution before and after 30 h of high energy milling

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Fig. 5

Simultaneous thermal analysis of the Zamak 2 powder after 30 h of milling

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Fig. 6

X-ray patterns of the Zamak 2 powder (a) after 30 h of milling and (b) after the STA at 500 °C

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Fig. 7

Density of the Zamak 2 before and after consolidation by sintering and hot pressing

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Fig. 8

Microstructure of the Zamak 2 alloy consolidated via: (a) sintering and (b) hot pressing (2kx and 3kx)

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Fig. 9

X-ray patters of Zamak 2 consolidated via sintering and hot pressing

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Fig. 10

Vickers hardness (HV1) of Zamak 2 alloy produced by casting, sintering, and hot pressing

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