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The role of pore evolution during supersolidus liquid phase sintering of prealloyed brass powder
Powder Metallurgy ( IF 1.4 ) Pub Date : 2020-05-26 , DOI: 10.1080/00325899.2020.1785155
Somayeh Ghasemi 1 , Maziyar Azadbeh 1 , Mehrdad Mousapour 2 , Ahad Mohammadzadeh 3 , Herbert Danninger 4 , Nushin Salimi 5
Affiliation  

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.

中文翻译:

预合金黄铜粉超固相液相烧结过程中孔隙演化的作用

摘要 本研究的目的是研究孔结构以及评估 Cu-28Zn 粉末样品在不同生坯密度水平和温度下的液相烧结行为。为此,将样品压实以获得六种不同的生坯密度,然后在 870°C、890°C 和部分在 930°C 下烧结 30 分钟。结果表明,晶粒内部形成的球状孔隙可因晶粒长大而被晶界扫过,并与原生孔隙结合,从而在较高温度下消除次生粒内孔隙,扩大粒间孔隙。此外,由于浮力,孔隙向上移动到样品顶部。
更新日期:2020-05-26
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