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題名 | AL-11% SI-0.2∼0.3% MG合金及AL-11% SI-0.3% MG/SICp複合材料顯微結構與性質之研究=The Microstructures and Properties of Al-11% Si-0.2∼0.3%Mg Alloys and Sic Particulates Reinforced Al-11%Si-0.3% Mg Composites |
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作者 | 楊智富; 邱垂泓; 沈煥欽; Yang, Chi-fu; Chiou, Chwei-horng; Shen, Huan-chin; |
期刊 | 大同學報 |
出版日期 | 19961100 |
卷期 | 26 1996.11[民85.11] |
頁次 | 頁381-390+430 |
分類號 | 440.367 |
語文 | chi |
關鍵詞 | AL-11% SI-0.2∼0.3% MG合金; AL-11% SI-0.3% MG/SICp複合材料; 顯微結構; |
中文摘要 | 本研究第一部份探討引進非熱處理型(Non-heat-treatable)高矽鋁合金輪圈材 料於國內鋁輪圈鑄造廠,研究方法包括合金選擇、試棒澆鑄,比較其與傳統 A356.2 鋁合金 輪圈材料機械性質、顯微結構及品質指數( Quality Index )之差異, 並探討非熱處理型 高矽鋁輪圈之調質( Modification )控制,最後進行生產線之試製。實驗結果顯示,適當 之高矽鋁輪圈材料之組成為 Al-11% Si-0.2 ∼ 0.3% Mg,對此合金而言, 適當之 Sr 調質 劑用量為 0.03%, 其共晶矽( Eutectic Silicon )之長短軸比( Aspect Ratio )約為 3:1;當使用 0.16 ∼ 0.32% Sb 調質時,其鑄造狀態( As Cast )下共晶矽之長短軸比約 為 14:1 ∼ 6:1,其調質效果與鑄件機械性質遠遜於 Sr 調質者,故 Sb 不適用於非熱處理 型高矽鋁輪圈材料之調質處理。由生產線鋁輪圈試製結果顯示,以 0.03% Sr 調質之非熱處 理型高矽鋁輪圈鑄件具有 4 ∼ 5 級的調質效果, 輪環( Rim )位置實體取樣之拉伸強度 、延伸率及品質指數分別為 184MPa、4.8% 與 286 MPa,其機械性質與顯微結構均與歐美地 區之高矽鋁輪圈相符合。本研究第二部份討論高矽含量鋁合金加入陶瓷強化顆粒而成之金基 複合材料之性質,並探討添加 Sr、Ca 與 Mg 對複合材料之界面行為、顯微結構及機械性質 之影響。 實驗結果顯示,添加 Sr、Ca、Mg,可明顯改善 Al-11% Si-0.3% Mg/SiCp 複合材 料之耐磨耗性質,其中尤以添加 Ca 者最為明顯,因其伴隨耐磨耗氧化物 CaO 之生成; 而 添加 Mg 者則有 MgO 生成增加其耐磨耗特性,Sr 則可改善複合材料內之共晶矽形態,並且 使之分佈均勻, 亦能大幅提升磨耗性質, 且延伸率亦獲致明顯之改善。 此外由 XRD 及 SEM/EDAX 分析顯示,高矽含量之 Al-11% Si-0.3% Mg/SiCp 複合材料於 850 ℃高溫長時間 靜置並無發現 Al �� C �鬲菪穻芋C |
英文摘要 | The first half of this work concerns a study on the feasibility of introducing non-heat-treatable high-silicon aluminum alloy wheel materials to domestic aluminum alloy wheel foundries. The Al-11% Si alloys containing 0.2 ∼ 0.3% Mg were selected as candidates in this study and subjected to a series of in-lab evaluations and production-line trials. The results showed that the Al-11% Si-0.2 ∼ 0.3% Mg alloy specimens can be best modified through an addition of 0.03% Sr which gave rise to a modification rating of class 4 ∼ 5. A water quench procedure of the castings right after their removal from mould was found beneficial to the mechanical properties. In comparison with the Sr-modified specimens, the Al-11% Si-0.2 ∼ 0.3% Mg alloys modified by 0.16 ∼ 0.32% Sb exhibit poor modification rating with aspect ratios of eutectic silicon ranging from 14:1 ∼ 6:1. Analysis of trial-cast Sr-modified high-silicon Al alloy wheels shows satisfactory microstructural characteristics with tensile strength, elongation and quality index of 184 MPa, 4.8% and 286 MPa, respectively, which were similar to those obtained from imported commercial non-heat-treatable high-silicon aluminum alloy wheels. The second half of this work aims to investigate the effects of wetting promoters Ca and Mg and the modifier Sr on the Al-11% Si-0.3% Mg/SiCp composites. The microstructures of the composite and the interphases at reinforcing particles/Al alloy matrix interface were investigated by OM, SEM/EDAX and XRD. Mechanical properties of the composites were examined by tensile tests, abrasive wear tests and bending test. The results showed that the bonding strength of SiC particulate to the aluminum alloy matrix can be greatly enhaced by the wetting promoter Ca and that the modifier Sr helps to produce desirable silicon morphology in aluminum alloy matrix for improved properties. |
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