Open AccessThe mechanism of the influence of Bi(or Sb) and rare earth on high temperature performance of AZ91 magnesium alloy
Author(s) -
Guoying Zhang,
Hui Zhang,
Dan Wei,
Zhicheng Luo,
Yucai Li
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.444
Subject(s) - materials science , alloy , magnesium , magnesium alloy , grain boundary , atom (system on chip) , cluster (spacecraft) , chemical physics , thermodynamics , crystallography , metallurgy , microstructure , physics , chemistry , computer science , programming language , embedded system
The atomic structure models of α matrix and the symmetric 0001 tilt boundary in AZ91 magnesium alloy were set up by using the concept of coincidence-site lattice (CSL). The total structure energy of α matrix and the grain boundary (GB)the environment sensitive embedding energies (EESE) of alloy elements and the interaction energies between the atom clusters were calculated by using recursion method. Calculation results show that the cluster formed by Al and RE in bulk AZ1 Magnesium alloy is rather stablebut the cluster of AlBi(or Sb) and RE atom is unstable. When Bi(or Sb) and RE atoms coexist in AZ91 magnesium alloyBi or Sb will combine with RE to form dispersed particles which are mainly RE2Bi (or RE2Sb ) and RE-Sb(or RE-Bi) distributed at the grain boundaryand Al11RE3 will form in the bulk in AZ91 magnesium alloy. The consumption of Al in magnesium alloy inhibits the formation of the discontinuous precipitate phase Mg17Al12. The melting points of compounds formed by RE and Al (or BiSb) are highthus the high temperature performance of AZ91 magnesium alloy would be obviously improved.