The role of pore evolution during supersolidus liquid phase sintering of prealloyed brass powder

Somayeh Ghasemi, Maziyar Azadbeh*, Mehrdad Mousapour, Ahad Mohammadzadeh, Herbert Danninger, Nushin Salimi

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

The aim of this research is to study the pore structure as well as to assess the liquid phase sintering behaviour of Cu-28Zn powder specimens at different green density levels and temperatures. For this purpose, samples were compacted to obtain six different green densities and then sintered at 870°C, 890°C and in part at 930°C for 30 min. The results revealed that the spherical pores which are formed inside the grains can be swept by grain boundaries due to grain growth and join to primary pores so that secondary intragranular pores are eliminated and intergranular pores enlarged at higher temperatures. Also, the pores move upwards to the top of sample due to buoyancy forces. The role of pore structure in distortion is more tangible at higher temperatures (930°C) so that O-shape and X-shape distortions were observed at high and low green density samples, respectively.

Original languageEnglish
Pages (from-to)187-196
Number of pages10
JournalPowder Metallurgy
Volume63
Issue number3
Early online date1 Jul 2020
DOIs
Publication statusPublished - 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • green density
  • pore structure and distortion
  • prealloyed brass powders
  • Supersolidus liquid phase sintering

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