%0 Journal Article
%T Effects of Pre-Ageing Treatment on Subsequent Artificial Ageing Characteristics of an Al-1.01Mg-0.68Si-1.78Cu Alloy<br>
%A Lizi He
%A Haitao Zhang
%A Jianzhong Cui Key Lab of Electromagnetic Processing of Materials
%A Ministry of Education
%A Northeastern University
%A Shenyang
%A China
%A <br>
%J 材料科学技术学报
%D 2010
%I 
%X The influences of pre-ageing temperature and natural ageing time on subsequent artificial age hardening behavior and precipitation sequence of new type Al-1.01Mg-0.68Si-1.78Cu alloy were investigated by hardness test, differential scanning calorimetry (DSC) test and transmission electronic microscopy (TEM) observations. When pre-ageing temperature is 20°C (natural ageing), the peak hardness of subsequent artificial aged alloy is lower than that of T6 treated alloy (negative effect), while a positive effect appears when pre-ageing temperature is above 80°C. The size of needlelike β-precipitate in subsequent artificial aged alloy is much coarser when pre-ageing temperature is 20°C, which causes a decrease in peak-hardness. The positive effect occurs again when natural ageing time is longer than 3 weeks. There are seven exothermic peaks in DSC curve of as-quenched alloy, while the number and height of exothermic peak decrease with increasing pre-ageing temperature and natural ageing time.
%K Al-Mg-Si-Cu alloy
%K Pre-ageing treatment
%K Age hardening
%K Differential scanning calorimetry (DSC) curve<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=324DC3CAB22330DB19158AE0A9B7BFA5&aid=9D60ACFA26DA2CE1A19787A5FBAF8722&yid=140ECF96957D60B2&vid=96C778EE049EE47D&iid=0B39A22176CE99FB&sid=A8DE7703CC9E390F&eid=769BD58726D66E7D&journal_id=1005-0302&journal_name=材料科学技术学报&referenced_num=0&reference_num=18