Modelling the high temperature flow behaviour of sintered Cu–28Zn pre-alloyed powder compacts considering the effect of strain

ABSTRACT

In the field of the deformation process modelling, constitutive equations tend to be utilised as a calculation basis for the estimation of the materials’ flow responses. This holds also for powder metallurgy products. Hence, in this study, the flow behaviour of sintered Cu–28Zn pre-alloyed powder compacts was investigated by a collection of isothermal hot compression tests in the temperature range of 550–850°C at strain rates of 0.001, 0.01, 0.1 and 0.5 s⁻¹ up to the true strain of 0.6. For the sintered part with a predefined porosity of 9.4%, the impacts of the temperature and strain rate on the deformation behaviour were shown by the Zener–Hollomon parameter in an exponent-type equation. As a result, a model was developed to predict the high temperature flow behaviour of the Cu–28Zn pre-alloyed powder compact. The results indicated that the strain-dependent constitutive equations are in good conformity with the experimental results.

KEYWORDS:

• Sintered brass
• pre-alloyed powder
• constitutive equation
• high temperature flow behaviour
• Arrhenius type equation

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes on contributors

Herbert Danninger studied Technical Chemistry at TU Wien, obtained his Ph.D. in 1980. Since that time he has been doing research in powder metallurgy. From 2003, he is full professor for chemical technology of inorganic materials at TU Wien, and currently he is also Dean of the Faculty of Technical Chemistry. He has published more than 450 articles, mostly on powder metallurgy topics, and holds 3 honorary doctorates.

Maziyar Azadbeh studied powder metallurgy at TU Wien, obtained his Ph.D. in 2006. Since that time he has been doing research in powder metallurgy. From 2010, he is associated professor for materials science and engineering at Sahand University of Technology, and currently he is also faculty member of Sahand University of Technology. He has published more than 100 articles, mostly on powder metallurgy topics.

Rozita Rouzegar studied master period of materials science and engineering in the field of metal forming at Shiraz University, and currently she is also Ph.D. student of the Sahand University of Technology, since 2012 and from that time she has been doing research in powder metallurgy and modelling of hot deformation.

ORCID

Rozita Rouzegar http://orcid.org/0000-0002-1696-1012

Herbert Danninger http://orcid.org/0000-0002-7205-9058