摘要
通过时效硬化曲线的测量及时效组织的透射电镜分析,研究了微量钪对Al Ag合金时效析出行为的影响。研究结果表明:在Al Ag合金中添加0.2%Sc(质量分数),可增强合金350℃的时效硬化效果,延长达到峰时效的时间。微观组织分析发现,微量钪的添加促使合金中γ′相弥散细小地析出,同时钪的存在减少了γ′相宽面上的位错台阶数。含钪Al 15Ag合金中γ′相长大过程比较缓慢的微观机理是微量钪的添加影响了合金中γ′相宽面上的台阶分布。
The age hardening behaviour and microstructure of Al-Ag-(0.2Sc) alloys were investigated. The results indicate that small addition of Sc can enhance the age hardening response of the Al-Ag alloy and prolong the time taken to the ageing peak. TEM observations show that the small addition of Sc results in a refinement of the distribution of γ′ precipitates. The mechanism by which trace Sc affect the microstructure is to reduce the ledge density of γ′ precipitates.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2004年第F01期280-284,共5页
The Chinese Journal of Nonferrous Metals
关键词
铝合金
时效
微观组织
钪
aluminium alloys
ageing
precipitation
scandium
