Deformation characteristics of polysynthetically twinned (PST) crystals during creep at 1150 K
作者： Gerhard Wegmann , Tomokazu Suda , Kouichi Maruyama
DOI: 10.1016/S0966-9795(99)00081-3
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摘要: Abstract The creep deformation characteristics of a lamellar polysynthetically twinned (PST) crystal the composition Ti–48 mol% Al was investigated as function orientation with respect to compression axis and applied stress. resistance hard PST plates parallel or perpendicular substantially higher than that soft orientations their oriented at intermediate angles axis. This fact could be associated predominant by modes slip plane inclined interfaces in contrast plates. In orientations, mainly straight ordinary dislocations Burgers vector b =1/2[1-10] aligned were encountered domains high resolved shear stress well no =1/2[110] superdislocations type =1/2〈112] observed. Despite certain domains, =〈101] not found play considerable role during under conditions. Cross twinning contributed favourably variants, but much more pronounced leading substantial refinement. microstructural hardening results observed exponents near unity stresses. A change exponent from stresses about 9 low occurs 200 MPa. critical MPa for is proposed reason exponent.
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