【摘要】 对Zn-Ni-Mg合金超塑性的m-C-δ或m-k-δ关系曲线（简称m-δ关系曲线）进行了测定。测到的曲线均属m_L=m_min型,可以用下面的C₂^δ_F-δ_L型L.Q.m-δ“规划”方程式表示δ（％）=[C₂^δ_F-δ_Lε^m-mo-1]×100 当δ=δ_O=0.00％时,m=m_O,C₂^δ_F-δ_L=1;当δ=δ_I时,m=m_I,C₂^δ_F-δ_L=C_I;当δ=δ_F时,m=m_F,C₂^δ_F-δ_L=C_F。ε为应变速率(min^-1)。将这类曲线称为C₂^δ_F-δ_L-(m_L=m_min)型曲线。在170,190,210,230和250℃的温度,若速率为3.5×10^-2min^-1（平均）测到的曲线均属基本形式。关系成近似的直线上升。其斜率在极限应变δ_L处突然增大,直到断裂。若速率为1.9×10^-2和8.6×10^-2min^-1测到的曲线均属单纯的上升式。(m_L=m_min)=m_O<m_F,δ_L=δ_O<δ_F。C₂^δ_F-δ关系亦成近似的直线上升,直到断裂,但其斜率不发生突然变化。更多还原

【Abstract】 The m-c-δ or m-k-δ curves （simply m-δ curves） have been determined. All curves belong to m_L=m_min, type and can be expressed by C₂^δ_F-δ_L type of "modified" L. Q. m-δ equation: where m=m₀, C₂^δ_F-δ_L=1, when δ=δ₀=0.00% m=m_I, C₂^δ_F-δ_L=C_I when δ-δ_I, m=m_F, C₂^δ_F-δ_L=C_F, when δ=δ_F. ε is the strain-rate sensitivity index of flow stress. This type of curve can be called C₂^δ_F-δ_L-(m_:=m_min) type of curve. At the temperatures of 170℃, 190℃, 210℃, 230℃ and 250℃, with ε=3.5×10^-2min, the curves obtained belong to the fundamental type in which δ_O<δ_L<δ_F, (m_L=m_min)_<mF⁽<m. The C-δ relations are nearly straight lines and their slopes increase suddenly until fracture. With ε=1.9×10^-2min^-1 (or 8.6×10^-2 min^-1), the curves belong to the ascending type, (m_L=m_min)=m_O<m_F,δ_O<δ_L<δ_F. The C-δ relations are also straight lines, However, their siopes are nearly constant without sudden change at the limit strain （δ_L）.更多还原