摘要
采用维氏硬度、室温拉伸性能测试、金相显微分析技术、透射电子显微分析等手段,研究Mg含量对Al-Cu-Mg-Ag耐热铝合金的组织和性能的影响。结果表明:随着Mg含量的增加,合金的时效响应速率加快,峰时效时间提前,且峰值硬度先增大后减小,在Cu/Mg摩尔比接近6时峰值硬度达到极大值;合金的抗拉强度和屈服强度先上升后下降,塑性则先降低后提高,但总体保持在较高水平;Mg含量(质量分数)为0.4%和0.8%时,合金的主要强化相为相和少量θ′相,Mg含量为1.2%的合金主要强化相为相和S′相,随着Mg含量的增加,相的体积分数增大,尺寸减小,分布更加均匀,但当Mg含量增大到1.2%时,相的体积分数有所减小。
The effects of Mg content on the mechanical properties and microstructures of Al-Cu-Mg-Ag alloy were studied by Wicker hardness test （HV）, room temperature tensile properties, optical microscopy （OM） and transmission electron microscopy （TEM）. The results show that with the increase of Mg content, the aging response rate is accelerated, the peak aging is advance, and whereas the peak hardness increases at first and then decreases which reaches its maximum when the Cu/Mg ratio closes to 6. With the increase of Mg content, the yield strength and the tensile strength increase first and then decrease, while the plasticity is just the opposite, but it maintains at a high level. The main strengthening phases areΩphase and a bit ofθ′phase when the Mg content （mass fraction） is 0.4%or 0.8%, but translate toΩphase and S′phase when the Mg content is 1.2%. The volume fraction ofΩphase increases with the increase of Mg content, the size decreases and it distributes more uniform. However, the volume fraction ofΩphase decreases to some extent when the Mg content is 1.2%.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2013年第7期1812-1818,共7页
The Chinese Journal of Nonferrous Metals
基金
中南大学中央高校基本科研业务费专项资金资助项目(2012zzts067)
