2010-04-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/682097摘要：本計畫研究極輕質高制振能鎂合金，選擇Mg-xLi合金，x在11wt.%以上使其比重能在1.50左右或以下，以達極輕質之目標。此等極輕質鎂合金將借由動力機械分析儀(DMA)來探討其制振能tanδ的大小，以瞭解合金之組成、加工之織構等對其制振能大小的影響，並由實驗之結果探討整理出tanδ能大於0.025之高制振能極輕質鎂合金。Mg-Li合金在常溫下應有好的加工性，但其強度卻有待提升，本計畫也同時研究如何借由合金元素之添加及固溶強化等方法來強化Mg-xLi合金之抗拉強度能達120MPa以上，同時對其制振能之影響能降至最低。<br> Abstract: The aim of this study is focused on the investigation of extra-light magnesium alloys. Mg-xLi alloys with x≧11wt.% are selected and their specific weight is asked to be about or lower than 1.50. These selected alloys will be studied their damping capacity of tanδ values by dynamic mechanical analysis (DMA) tests. The damping properties of these selected alloys affected by alloy’s composition, deformation texture, heat treatment, etc, will be studied and experimental results will be discussed. From testing results, the qualified high damping Mg-Li alloys which have their tanδ value higher than 0.025 and their tensile strength higher than 120 MPa will be found out. In this year, Mg-14 wt.% Li alloy and Mg-11 wt.% Li alloy with soluted Sc will be selected to investigate. The Mg-14 wt.% Li alloy will focus on the study of its damping properties and the Mg-11 wt.% Li will study its strengthing effect and tanδ value by soluted Sc atoms.鎂鋰合金輕質合金制振能動力機械分析儀tanδ值Mg-Li alloysextra-light alloysdamping capacitydynamic mechanical analysis (DMA)tanδ value