Deformation　twinning　induces　stress　in　alloy　matrixes,　but　stress　relaxation　modes　have　not　been　identified　in　the　microstructure　of　hexagonal-close-packed　alloys.　We　investigated　this　issue　in　a　deformed　Mg　alloy　during　heating.　The　{10-12}　deformation　twinning　induced　stress　in　the　Mg-Y-Nd-Zn　alloy　matrix,　caused　lattice　distortion　near　the　twin　boundary　and　generation　of　stacking　faults　from　the　step　at　the　twin　boundary.　At　400　degrees　C,　the　kink　band　formed　in　the　distortion　region　and　the　stacking　faults　formed　long-period　stacking　structures,　relaxing　the　stress　induced　by　{10-12}　deformation　twinning.　(C)　2015　Elsevier　Inc.　All　rights　reserved.