晶內(nèi)固溶度的影響
(1. 大連理工大學(xué) 材料科學(xué)與工程學(xué)院，大連 116024；
2. 北京航空材料研究院，北京 100095)
摘 要: 分別采用電磁鑄造和普通連鑄技術(shù)制備Al-Zn-Mg-Cu-Zr合金，研究電磁場(chǎng)對(duì)合金顯微組織、合金元素晶內(nèi)固溶度的影響。結(jié)果表明：采用電磁鑄造技術(shù)制備的Al-Zn-Mg-Cu-Zr合金具有良好的表面質(zhì)量和內(nèi)部組織；電磁場(chǎng)顯著提高合金元素在晶內(nèi)的固溶度，減小了微觀偏析程度。相對(duì)于普通連鑄，電磁鑄造法制備的Al-Zn-Mg-Cu-Zr合金的晶粒平均尺寸從68 mm減小到53 mm，Zn、Mg和Cu元素的晶內(nèi)相對(duì)溶質(zhì)固溶度分別由56%、62%和25%提高到79%、74%和44%。
關(guān)鍵字: Al-Zn-Mg-Cu-Zr合金；電磁鑄造；普通連續(xù)鑄造；顯微組織；相對(duì)溶質(zhì)固溶度
solid solubility inside crystals of Al-Zn-Mg-Cu-Zr alloy
（1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China;
2. Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:Al-Zn-Mg-Cu-Zr aluminum alloys were prepared by electromagnetic casting (EMC) and direct chill casting (DCC), respectively. The effects of electromagnetic field on as-cast microstructure and alloy elements solid solubility inside crystals of Al-Zn-Mg-Cu-Zr aluminum alloy were investigated. The results show that the Al-Zn-Mg-Cu-Zr alloy billets prepared by EMC have better surface qualities, microstructures and higher solid solubility inside crystals of alloy elements. The degree of microsegregation in the EMC billet decreases. Compared with the DCC specimens, the average grain size of the EMC specimens decreases from 68 μm to 53 μm, moreover, the relative intracrytalline solubilities of elements Zn, Mg and Cu increase from 56%, 62% and 25% to 79%, 74% and 44%, respectively.
Key words: Al-Zn-Mg-Cu-Zr alloy; electromagnetic casting; direct chill casting; microstructure; relative intracrytalline solubility
