金属材料の強度と延性

抄録

An attempt has been made to obtain the relation between strength and ductility parameters in tensile deformation of various metals and alloys used in engineering fields. In the tensile strength (σ_B)-uniform elongation (ε_U) diagram, the data were classified into several curves depending on crystal structure and stacking fault energy. Materials with low stacking fault energy such as stainless steel SUS 304 have an excellent σ_B-ε_U relation, while hop materials such as zinc and magnesium have low σ_B and σ_U compared with the standard curve obtained for ferrite steels, copper and aluminium. The relation between yield ratio (σ_Y/σ_B) and ε_U for all materials investigated in the present study is roughly summarized by a single curve, although the curve does not exactly agree with the theoretical curve generated under the assumption that the stress-strain relation obeys the n-th power law.