Cutting test were carried out for the two main groups in the cutting tests, one is regular type turning with a high speed steel tool and with a carbide tool, another is mirror finished cutting with a diamond tool.
Cutting force was found rather low in the none Mg alloy and in 4.41% Mg alloy cutting when the cutting speed was higher than 2m/s and Mg content was more than 2.48% built up edge was almost disappeared. Chips disposal was improved slightly by containing Mg in the alloy. In the regular type turning, depth of affected layer of cut surface was decreased by increasing Mg content. On the other hand, affected layer of mirror finished surface was so small depth and the surface roughness (Rmax) of 0.02-0.03μm was generated in the mirror finished cutting of every kind of alloys in this test. Reflection factor of the mirror finished surface of rich Mg content was better than that of little Mg content.
