摘要
The effects of fabrication processing methods on the workability of Mg-Zn-Zr wrought magnesium alloy(ZK60A) were investigated based on the microstructure and inherent internal defects. Three different billets, semi-continuously cast, semi-continuously cast and subsequently extruded, and die-cast, were fabricated and uniaxially compressed at elevated temperatures and two different strain rates to determine the deformation capabilities. The grain structure of the billets was investigated using electron backscatter diffraction(EBSD) and transmission electron microscopy(TEM). The internal defects were inspected by an X-ray scanner. The enhanced deformability was observed in semi-continuously cast billet compared to the one fabricated by conventional die-casting, and the subsequent extrusion further improved the deformability.
通过微观组织和固有内在缺陷观察,研究了加工方法对ZK60A变形镁合金加工性能的影响。利用半连续铸造、半连续铸造后挤压及模具铸造方法制备了3种合金,并在2种变形速率下进行高温压缩,研究合金的变形能力。利用EBSD和TEM研究了合金的晶粒结构,采用X射线扫描仪检测了合金的内部缺陷。与传统模具铸造合金相比,半连续铸造合金具有更好的变形能力,且后续的挤压工艺可以提高合金的变形能力。
基金
Project(B551179-11-02-00) supported by a Grant from the Co-operative Research Project Funded by the Ministry of Trade,Industry&Energy,Korea
