| 摘要 |
<p>A method of manufacturing an article by casting the article from a hypo-eutectic aluminium-silicon alloy comprising (by weight): 8.5-11 % silicon, 0.6-0.85 % manganese, >0.15-0.6 % iron, up to 0.25 % zinc, up to 0.1 % magnesium, not more than 0.05 % strontium, not more than 0.001 % molybdenum, up to 0.25 % other alloying and/or refining elements including one or more of Cr, Ni, Cu, Pb, Sn, Ti, with the balance being aluminium and impurities, and then annealing the cast alloy at a temperature in the range 300-400 0C for 15-35 minutes. The Fe:Mn ratio preferably lies in the range 1:5 to 4:5. The alloy can be cast into an ingot or into a vehicle component such as a front shock tower or an engine mount bracket. The article can have a yield strength of 90 MPa or more, a tensile strength of 175 MPa or more and an elongation of 8 % or more.</p> |
