Abstract
Mg-3.0Nd-0.2Zn-0.4Zr (wt.%, NZ30K) alloy shows middle strength and high toughness, potentially being applied as a wrought alloy. In this paper, this alloy is first successfully cast into some billets in a diameter of 100mm by direct chill (DC) casting. The optimal casting temperature is 700°C and casting speed is 90mm/min. Then, the deformability of NZ30K alloy billets was modeled by using uniaxial tensile and compression tests at different process parameters. The results show that the optimum deformation temperature of the as-cast NZ30K alloy is between 350 and 400 °C and strain ratio ranges from 0.01 to 1 s-1. Finally some round and rectangular tubes (which are also bent and weld into a support frame for an auto instrument panel) are successfully extruded, and an end cover for auto transmission case is successfully forged. Both the extruded and forged demo parts show good mechanical properties. The maximum ultimate tensile strength, yield strength and elongation of the T5 state alloy are 323 MPa, 318MPa and 11.2%, respectively.
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