摘要
用高温熔体X射线衍射仪对Al TM (TM =Fe,Ni)合金的熔体结构进行了实验研究 .在Al 1.0at%Fe(原子百分比 )合金的结构因子曲线S(Q)上 ,温度为 6 70℃时 ,存在预峰 ,即中程有序结构 ,当温度过热到 140 0℃时 ,预峰消失 .Al 2 0at%Ni合金熔体温度在≤ 130 0℃范围内 ,存在预峰 ;温度高于 140 0℃时 ,预峰逐渐消失 .这些实验结果表明 ,Al Ni,Al Fe合金熔体中除存在短程有序结构外 ,还存在中程有序结构 .这种中程有序结构的存在与消失与温度有关 .在相似的条件下 ,Al Si合金中没有发现中程有序结构 .
Liquid structure of Al-TM (TM = Fe, Ni) alloys was studied by high temperature X-ray diffractometer. In the structure factor S (Q) of Al-1. 0at% Fe alloy, it is found that there exists a small prepeak at 670 degreesC, implying the medium range order (MRO) structure; the prepeak disappears when the temperature is up to 1400 degreesC. For Al-20at% Ni alloy, the prepeak exists in S (Q) when the temperature is lower dim 1300 degreesC, and it is weakened drastically when the temperature surpasses 1300 degreesC. In the same experiment conditions, there is no such prepeak, namely MRO structure in S( Q) of pure Al and Al-12.5at% Si alloy. These results show that there exists not only the short range order (SRO) structure but also MRO structure in the Al-TM melts, and the MRO is correspondent with the tendency of formation of chemical compounds.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2002年第7期1215-1219,共5页
Acta Chimica Sinica
基金
国家自然科学基金 (No .5 0 0 710 2 8)
山东省自然科学基金 (No .Z2 0 0 1F0 2 )资助项目
