ISSN:
1573-4803
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Maschinenbau
Notizen:
Abstract The details of structure modification on α2/γ interface induced by deformation in a hot-deformed Ti-45Al-10Nb alloy were investigated by conventional and high-resolution transmission electron microscopy. A new type of dislocation ledge containing 1/3[111] partials was identified. The Burgers vectors of these dislocation ledges were determined to be 1/2[110] or 1/2〈101]. The formation mechanism of this new type of dislocation ledge is discussed. Also, two types of hot deformation induced α2/γ interfaces, coherent interfaces with high density of ledges and misoriented semi-coherent α2/γ interfacial boundaries were observed. For the misoriented semi-coherent α2γ interfaces, the density of dislocation ledges in these interfaces increases with the misoriented angle between the (111) $$_\gamma $$ and (0001) $$_{\alpha 2} $$ planes, and 1/3[111] partial dislocations were involved in all the dislocation ledges. The formation mechanism of these deformation-induced α2/γ interfaces were discussed related to the role of α2/γ interfaces adjusting the deformation as a dislocation sink absorbing the slipping dislocations in the γ phase. Moreover, misoriented semi-coherent α2γ interface related deformation twinning and structure transformation induced by deformation were analyzed and discussed related to the role of α2/γ interfaces as a dislocation source during deformation.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1023/A:1004711216371
Permalink
