摘要
采用光学金相(OM)、扫描电镜(SEM)、差示扫描量热(DSC)等技术对7175合金铸锭均匀化工艺进行研究。结果表明:铸锭中结晶相主要为T相(AlZnMgCu)与Al7Cu2Fe相,大量分布在晶界处,晶内较少;采用450℃/5 h+470℃/24 h对铸锭进行均匀化处理,不但能够消除铸态低熔点非平衡共晶相,而且可以有效促进微量元素Cr以弥散相形式均匀析出。
The homogenization process of 7175 alloy ingot was studied by optical metallography(OM),scanning electron microscopy(SEM)and differential scanning calorimetry(DSC).The results show that the crystallization phases in the ingot are mainly T phases(Al⁃ZnMgCu)and Al7Cu2Fe phases,and a large number of them are distributed in the grain boundary.The homogenization of ingot at 450℃/5h+470℃/24h can not only eliminate the non-equilibrium eutectic phase with low melting point as cast,but also promote the uniform precipitation of trace element Cr in the form of dispersion phase.
作者
张芯华
Zhang Xinhua(Southwest Aluminum(Group)Co.,Ltd.,Chongqing 401326,China)
出处
《铝加工》
CAS
2023年第3期49-52,共4页
Aluminium Fabrication
