A grain boundary engineering approach to promote special boundaries in Pb-base alloy

Microstructure tailoring for property improvements by grain boundary engineering

“…Due to the special properties of the low-R CSLBs, grain boundary engineering (GBE) was proposed as an approach to control the properties of polycrystalline metals by tuning grain boundary character distribution (GBCD) to obtain a high fraction of low-R CSLBs and interrupt the connectivity of random boundaries. GBE has been used to improve the properties of polycrystalline metals such as strength [3], creep [4], weldability [5], and stress corrosion cracking [6]. Among the low-R CSLBs, the contribution of R3 boundaries to the property improvements has 0022-3115/$ -see front matter Ó 2007 Elsevier B.V. All rights reserved.…”

An electron backscattered diffraction study of grain boundary-engineered INCOLOY alloy 800H

“…Detailed information about the CSL model and CSL effect on GBE may be found in Reference 2. Recently, sequential thermomechanical processing such as mechanical deformation by cold rolling followed by midor high-temperature annealing has been adopted to optimize the GBCD by increasing the proportion of low-⌺ CSLBs and breaking up the interconnected random GB network. [3] It is evident that GBE improves properties such as strength, [4] ductility, [5] creep, [6] weldability, [7] and intergranular corrosion or stress-corrosion resistance. [8] The INCOLOY* Alloy 800H was introduced to the *INCOLOY is a trademark of INCO Alloys International, Huntington, WV.…”

Effect of thermomechanical processing on grain boundary character distribution of a Ni-based superalloy

“…The increased fractions of R3 n boundaries indicate that a lot of twinning and multiple twinning events occurred during annealing after cold rolling to $5%. This is desirable for property improvement of materials [3][4][5]11]. As shown in Fig.…”

“…Grain boundary engineering (GBE), proposed by Watanabe [2] in the early 1980s, has been extensively investigated as an approach to improve properties such as creep [3] and stress corrosion cracking resistance [4], by promoting a high proportion of low-R (R 6 29) coincidence site lattice boundaries (CSLBs) in materials. In the nomenclature of the CSL model, the newly formed superlattice is denoted by a value of R, where the R value is defined as the reciprocal of the fraction of lattice points in the boundaries that coincide between the two adjoining grains.…”