Effect of ball milling time on microstructure and properties of Laves phase NbCr2alloys synthesized by hot pressing

Xuan XIAO, Shi qiang LU, Ping HU, Ming gang HUANG, Mingwang Fu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

Laves phase NbCr2alloys with a composition of Nb-66.7Cr (molar fraction, %) were prepared by mechanical alloying and hot pressing. The microstructures and properties of the Laves phase NbCr2alloys, prepared from elemental niobium and chromium powders under various ball milling time by hot pressing at 1 250 °C for 0.5 h, were investigated. The results indicate that if the ball milling time is longer than 40 h, the synthesizing reaction of Laves phase NbCr2can be accomplished much sufficiently. Then the nearly full-dense Laves phase NbCr2alloys can be prepared by hot pressing from ball milled powders with more than 40 h. The hot pressing sample with homogeneous and fine microstructure made from 40 h ball milled powders has the optimum microstructure and properties. It has a relative density of 98.1%, Vickers hardness of 11.4 GPa, compress strength of 1 981 MPa and fracture toughness of 4.82 MPa·m1/2. The effect of fine grain toughening is fully realized.
Original languageEnglish
Pages (from-to)545-551
Number of pages7
JournalTransactions of Nonferrous Metals Society of China (English Edition)
Volume19
Issue number3
DOIs
Publication statusPublished - 1 Jun 2009

Keywords

  • hot pressing
  • Laves phase NbCr 2
  • mechanical alloying
  • mechanical properties
  • microstructure

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Geotechnical Engineering and Engineering Geology
  • Metals and Alloys
  • Materials Chemistry

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