The Role of Nano-sized Fraction on Spark Plasma Sintering the Pre-Alloyed Spark-Erosion Powders

摘要

Ti-Ni-Hf, Ni-Al and Cu-Al-Ni shape memory materials were produced by spark plasma sinteringudmethod from the micron and nano-sized particles prepared by spark-erosion method in cryogenic liquidudfrom preliminary melted master alloys. The effects of spark plasma sintering processing parameters on theudmartensitic transformation and microstructure of the sintered compacts were investigated using XRD andudSEM methods. Although precipitating processes were usually not completely depressed, the intensiveudgrain growth was also not found in most cases. Most of the microstructure peculiarities of as processedudpowder were inherited by the sintered material. The contradictory role of the nano-sized fraction ofudpowders is discussed: in most case this fraction promotes the rapid sintering but also the oxidationudproceses in sintered compacts.When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/24890