摘要
对添加Zr与未含Zr的6082AlMgSi合金在250℃进行等温保温试验,研究了添加Zr后合金的高温软化趋势,并应用透射电子显微镜观察析出粒子的形态。结果表明,与未含Zr元素的合金相比,添加Zr的合金能明显阻碍保温过程中硬度的降低,其原因是在合金中析出了细小、弥散的Al3Zr粒子,有效地阻碍晶界的运动。含Zr与未含Zr合金在170℃时效过程中电阻变化的研究表明,两种合金的电阻随时效时间的延长均呈先快后缓地增加的趋势,但在同一时效时间里含Zr合金比未含Zr合金的电阻值低。这种现象可由Zr元素在合金中所起的作用进行合理的解释。
The influence of Zr on high temperature softening of 6082 A1-Mg-Si alloys was studied. The softening processes of 6082 alloys with Zr and without Zr,isothermally conditioned at 250℃ ,were investigated. The results show that inclusion of Zr inhibits the decrease of hardness in holding process compared with the alloys without Zr,which is due to the alloys with Zr precipitate disperse A13Zr particles that effectively restrict grain boundary movement. A study of resistance changes of alloys with Zr and without Zr under 170℃ aging was also carried out. The results show that in both cases the resistances increase first rapidly then slowly during ageing. However, the value of resistivity for the alloy with Zr is lower than that of the alloy without Zr in the same duration of aging,it can be explained in terms of the role of Zr in the alloy.
出处
《金属热处理》
EI
CAS
CSCD
北大核心
2005年第7期6-9,共4页
Heat Treatment of Metals
基金
上海市科委基金项目(0352nm099)
