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Research on Toughness and Mechanim of Intermetallic Compound Fe2B

Author: XuJuan
Tutor: CaoXiaoMing
School: Hebei University of Technology
Course: Materials Science
Keywords: Fe2B intermetallic compounds materials with corrosion resistance to molten zinc fracture toughness
CLC: O614.81
Type: Master's thesis
Year: 2008
Downloads: 90
Quote: 0
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Abstract


Fe2B is a typical kind of intermetallic compounds with the best behavior on corrosion resistance to molten zinc and eigen-brittleness.This restricts the industry application for Fe2B on high temperature structure materials.So it is required to put up studies on improving toughness of Fe2B.In this paper,the valence electron structure of (Fe1-xCrx)2B has been calculated on basis of solid and molecule’s empirical electron theory and average atom model.Then tests on Fe-8.8B-XCr（Mn or La） samples were put into effect for its mechanical properties.The results show that,there’s little effects on the structure of samples or microhardness of Fe2B including Cr or Mn or La.There’re also Fe2B andα（including little C or Si） and microhardness is proximity 1100HV0.1.The bending strength of （Fe,Cr）2B can be raised from 203 MPa to 387MPa.There’re increasing effects on the fracture toughness of samples, especially for Cr,KIc can be increased from 28.61 M Pam1/2 to 65.85 M Pam1/2.After calculation,it was found that the B-B bond energy increased from 5.6574 kJ/mol to 79.0047 kJ/mol obviously,which can lessen occurrence of initial cracks.It was found that the crystallographic orientation of fracture plane in Fe-8.8B is {110}.For samples including Cr,it needs 342.0531 kJ/mol to crack along （110）,which is greater than Fe2B.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > First Ⅷ group metal elements and their compounds > Iron metal element
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