The synthesis and characterization of ultrafine grain NiAl intermetallic

Autor:	Kai Zhang, G.H. Xu, Z.Q. Huang
Rok vydání:	2012
Předmět:	Nial Materials science Annealing (metallurgy) General Chemical Engineering Metallurgy Intermetallic Sintering Microstructure Indentation hardness Grain size Nanocrystalline material Mechanics of Materials computer computer.programming_language
Zdroj:	Advanced Powder Technology. 23:366-371
ISSN:	0921-8831
Popis:	The nanocrystalline NiAl powders were synthesized by mechanical alloying (MA), and the ultrafine grain NiAl bulk materials were subsequently consolidated by vacuum hot-pressed sintering. The microstructure and mechanical properties of milled powders and bulk materials were characterized. The results reveal that the NiAl powders were synthesized after 1.67 h of milling and the grains of NiAl were refined to 18 nm after 22 h of milling. During milling, the temperature rise caused by MA led to the annealing effect and consequently resulted in the abnormal decrease in microstrain and microhardness. NiAl bulk material with a relative density of 99.4% was prepared after sintering at 1300 °C and its grain size was about 400 nm. Due to fine-grain strengthening, the compressive stress and compressive strain of NiAl bulk material were significantly improved at room temperature.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::01af3105446fcb2dd725a183be9ff3c9 https://doi.org/10.1016/j.apt.2011.04.016 Zobrazit plný text záznamu Full Text from ScienceDirect