Tension and compression tests for a rare-earth-containing alloy sheet, Mg–1.9Mn–0.3Ce (wt-%), are performed under quasi-static and high-rate loadings along the rolling, transverse and normal direction, and stress – strain responses exhibit positive strain-rate dependence. Empirically based Johnson-Cook constitutive model is modified to describe the rate-dependent plastic deformation in multiple loading directions. A strong strength differential effect persists, and such effect is shown to be stronger at high strain rates. A weak in-plane anisotropy exists in the initial yielding and subsequent strain hardening behaviour as well as strength differential effect. In contrast, the out-of-plane anisotropy in compression is apparent and is approximately rate insensitive. Microstructural observations indicate that twinning plays the key role for the enhancement of strain-hardening rate under high strain-rate deformation.

含稀土合金板 Mg-1.9Mn-0.3Ce (wt-%) 的拉伸和压缩试验是在准静态和高速载荷下沿轧制、横向和法向以及应力进行的 -应变响应表现出正应变率依赖性。对基于经验的 Johnson-Cook 本构模型进行了修改，以描述多个加载方向上与速率相关的塑性变形。强烈的强度差异效应持续存在，并且这种效应在高应变率下表现出更强。在初始屈服和随后的应变硬化行为以及强度差异效应中存在弱的面内各向异性。相比之下，压缩中的平面外各向异性很明显，并且几乎对速率不敏感。