摘要
制备了含量为1．56％(质量分数)的铜铬合金粉体并对粉体压坯及时效处理,用高分辨电镜观察了不同时效阶段的结构。时效的前期阶段观察到了一种长周期调制结构,命名为调制结构I;时效时间45 min时观察到了另一种DO3型调制结构,命名为调制结构II;并对两个调制结构进行了晶体结构分析。结果证明该条件下过饱和铜铬合金时效过程的析出机制并非传统意义上的由FCC结构直接转变为BCC结构,而是以两个调制结构为过渡相逐步转变的。
Cu-1.56Cr alloy was prepared. Its structures in different aging stages were observed by TEM. In the initial stage, a modulated structure was found which is an ordered intermetallic phase named modulated structure I, and other modulated structure with DO3 type was found named modulated structure II upon aging at 500℃ for 45 min. The results show that the precipitation sequence of Cu-Cr alloy during aging does not to the traditional direct transformation form FCC structure to BCC, but to the sequence of gradual transformation from a modulated structure to another modulated structure.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2006年第A02期259-262,共4页
Rare Metal Materials and Engineering
基金
云南省学术技术带头人后备人才培养项目(2003RC2711)
