Al相的固溶體結(jié)構(gòu)
(1. 黑龍江科技學(xué)院 材料科學(xué)與工程學(xué)院，哈爾濱 150027；
2. 哈爾濱工程大學(xué) 超輕材料與表面技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室，哈爾濱 150001；
3. 哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱 150001)
摘 要: 采用X射線衍射儀、能譜儀和透射電鏡分別對(duì)Al-9.6%Mg合金、Al-11Mg-4.5Zn合金和Al-17Zn-1.5Mg合金常壓及6 GPa高壓凝固后Al相的固溶體結(jié)構(gòu)進(jìn)行研究。結(jié)果表明：6GPa高壓凝固后，Al-9.6%Mg合金中Mg在Al相中的固溶度顯著增大；在Al-11Mg-4.5Zn合金和Al-17Zn-1.5Mg合金中，Mg、Zn溶質(zhì)在Al相中的固溶度均增大，但Zn比Mg固溶的比例要大得多。在常壓凝固條件下，與純鋁相比，3種合金中Al相的晶格常數(shù)均增大。與常壓凝固相比，高壓凝固Al-9.6Mg合金和Al-11Mg-4.5Zn中Al相晶格常數(shù)分別增大了1.178%和0.220%；在Al-17Zn-1.5Mg合金中，Al相晶格常數(shù)變化很小。此外，在Al-Mg-Zn合金中，原子半徑較大的Mg固溶到Al相中，導(dǎo)致其晶格常數(shù)增大，原子半徑較小的Zn固溶到Al相中，導(dǎo)致其晶格常數(shù)減小，且高壓凝固后，溶質(zhì)的原子半徑越小，在Al相中固溶的比例越大。
關(guān)鍵字: Al-Mg合金；Al-Mg-Zn合金；高壓凝固；Al相；固溶體結(jié)構(gòu)
（1. School of Materials Science and Engineering, Heilongjiang University of Science and Technology,
Harbin 150027, China;
2. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education,
Harbin Engineering University, Harbin 150001, China;
3. College of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
Abstract:The solid solution structures of Al phases in Al-9.6%Mg，Al-11Mg-4.5Zn and Al-17Zn-1.5Mg alloys solidified under normal pressure and high pressure were investigated using XRD, EDS and TEM. The results show that the solid solubility of Mg in Al phase in Al-9.6%Mg alloy increases remarkably, and those of Mg and Zn in Al phase in Al-11Mg-4.5Zn and Al-17Zn-1.5Mg alloys increase, however, the proportion of Zn saturating in Al phase is much more than that of Mg. Under the condition of normal pressure solidification, the lattice constants of Al phases in three alloys have an increment comparing with that of pure Al. In contrast to normal pressure solidification, the lattice constants of Al phases in Al-9.6Mg alloy and Al-11Mg-4.5Zn alloy solidifying at 6 GPa high pressure increase up to 1.178% and 0.220%, respectively. And the lattice constant of Al phase in Al-17Zn-1.5Mg alloy changes little. Furthermore, Mg with larger atomic radius saturating in Al phase leads to the increment of the lattice constant in Al-Mg-Zn alloy, and that of Zn with smaller atomic radium causes the lattice constant to decrease. The smaller the atomic radium of the solute is, the more the proportion saturates in Al phase after high pressure solidification are.
Key words: Al-Mg alloy; Al-Mg-Zn alloy; high pressure solidification; Al phase; solid solution structure
