Abstract
The constitutions of the Mg rich alloys containing Al and Zn were investigated by means of thermal analysis, and microscopic examination. From various constitutional sections taken through the Mg axis, the following conclusions were drawn: The solubility curves were found to be:-(Mg)_??_δ+T1 (ternary compound), (Mg)_??_ζ+T1. The chill cast alloys corresponding to the 6 sections cut through the Mg-axis were prepared, and after annealing they were quenched in water and aged at room temperature. The change of hardness during the ageing was measured with a baby Brinell tester. The hardness test indicates that the alloys containing Al less than the ratio Al:Zn=1:2.4 do not show less age-hardening at room temperature, but the alloys containing Al more than this ratio show a marked increase by the natural age-hardening. By tempering at 100° and 200° immediately after quenching, the alloys containing Al and Zn in the ratio 2.4:1 were hardened rather remarkably. Mechanical properties of alloys hardened rather remarkably were as follows: Tensile strength (kg/mm2) Elongation (%) B. H. N. As chill cast 21_??_25 1_??_5 60_??_65 as age-hardened 30_??_34 0_??_3 85_??_100
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
