The Effects of Sintering Temperature on the Densification of Mechanically Alloyed W-Brass Composites

• 作者: Baba Gowon Kahtan S. Mohammed Polycarp Evarastics Shamsul Baharin Bin Jamaluddin Zuhailawati Hussain
• 来源期刊: 金属学报(美国)
• 学科: 工学
• 关键词: W-Brass TEMPERATURE DENSIFICATION Prealloy HARDNESS
• 年，卷（期）: jsxbmg_2015,（3）
• 页码范围: 19-26
• 页数: 8页
• 分类号: TB3

摘要

Prealloyed (PA) and premixed (PM) W-brass with the composition of 60 wt% W, 1 wt% Ni and 39 wt% brass was sintered at the temperature of 800&degC, 920&degC and 1000&degC each. As a result of difficulties in the densification of W-Cu and W-Cu alloys, mechanical alloying (MA) and activated sintering were combined. The powders were mechanically alloyed for 13 hours to produce nanosized W grains embedded in brass. The microstructure and properties of these composites with increase in sintering temperature has been studied. Both prealloyed and premixed composites sintered at 800&degC (solid state sintering) and 920&degC (sub-solidus state sintering) have lower sintered densities and hardness. The densification rate in the premixed composites was observed to be higher than that of the prealloyed composites. Their densification and properties increased with the increase in the sintering temperature. Premixed composite sintered at 1000&degC had 91.0% sintered density, 180 Hv microhardness against 76.0% and 133 Hv respectively for prealloyed composite at the same temperature. The values of electrical conductivity in both prealloyed and premixed composites increased with increase in temperature.