Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20154
Title: The effect of hot pressing time on the microstructure and properties of Laves phase NbCr2 alloys
Authors: Xiao, X
Lu, SQ
Hu, P
Huang, MG
Nie, XW
Fu, MW 
Keywords: Fine grain toughening
Hot pressing
Laves phase
Mechanical alloying
Microstructure and properties
NbCr2 alloy
Issue Date: 2008
Publisher: Elsevier Science Sa
Source: Materials science and engineering a, 2008, v. 485, no. 1-2, p. 80-85 How to cite?
Journal: Materials Science and Engineering A 
Abstract: The microstructure and properties were investigated on the Laves phase NbCr2 alloys prepared through 20 h mechanical alloying of niobium and chromium powders and subsequent hot pressing at 1250 °C for different time. The results indicate that the Laves phase NbCr2 alloy with homogeneous microstructure and fine grains and high relative density is obtained. With the increase of hot pressing time, the density, grain size and Vickers hardness increase, the fracture toughness, however, decreases gradually. The alloy fabricated by hot pressing at 1250 °C for 30 min has the best overall properties. Its average grain size reaches about 248 nm, the relative density is 97.8% and the fracture toughness at room temperature is more than 4.7 MPa m1/2. Compared with the Laves phase NbCr2 alloy prepared by arc-melting, which has the fracture toughness of 1.2 MPa m1/2, the fracture toughness in this research is increased significantly.
URI: http://hdl.handle.net/10397/20154
DOI: 10.1016/j.msea.2007.08.004
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