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    請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/1981


    題名: 汽車車體用鋁合金板材、擠型材之研究
    作者: 阮啟偉;Qi-Wei Wan
    貢獻者: 機械工程研究所
    關鍵詞: 擠型;滾軋;彎曲性;熱處理;微結構
    日期: 2001-06-26
    上傳時間: 2009-09-21 11:35:40 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 本論文的材料有三種,一為滾軋材6022與6111鋁合金,一為擠型材6N01鋁合金。6022、6111合金在探討材料的彎曲性,變動參數有(1)不同化學組成、固溶溫度(530℃、550℃)、淬火速率(淬水、空冷、爐冷)及低溫時效(30℃、50℃、70℃×1~10000min)。6N01分為兩方向研究:(1)利用不同化學組成(標準成份、過量Mg、過量Si、過量Cu)、預熱溫度(480℃、530℃)、淬火速率(淬水、空冷、爐冷)及175℃人工時效下,各個時間的彎曲性優劣情形(2)不同化學組成、預時效(-10℃~70℃ ×1~3000min)對人工時效析出的影響。 實驗中利用微差掃描熱分析(DSC)及電阻量測來研究合金的時效析出舉動,穿透式電子顯微鏡(TEM)觀察合金晶內、晶界析出與PFZ大小,掃描式電子顯微鏡觀察材料破裂形態,彎曲測試材料的變形能力,並以拉伸試驗(Tensile Test)來量測合金降伏強度、最大抗拉強度及延伸率的高低。 6022、6111合金在各種固溶、淬火、化學組成、低溫時效後經彎曲測試,雖然在某些條件下強度有大幅增加,但是仍然擁有低降伏強度與高延伸率,所以合金不致於破裂。 實驗結果得知6N01合金強度愈低、延伸率愈高時,可得到較佳的彎曲性,因為降伏強度(YS)代表了塑性變形的難易程度,當YS低時,只需施加應力,就可以讓材料產生形變;低預熱溫度可增加彎曲性。6N01PB、6N01PS、6N01PM合金在-10~30℃預時效,再經人工時效後強度下降,但是於50~70℃對材料有正面影響。 There are three kinds of aluminum alloys investigated in this paper. One is extruded 6N01 alloy, others are rolled 6022、6111 alloys. To discuss the bending ability of 6022,6111 alloys with the experiment the parameters including of (1)different chemical compositions,solution temperature,cooling rate after solution and (2)low temperature aging. For 6N01 alloy, we are interested in finding(1)bending ability by using different chemical compositions,re-heating temperature,cooling rate after re-heating and 175℃ artificial aging for different time (2) the influence of different chemical compositions,pre-aging on the aging precipitation behavior after artificial aging. Precipitation behaviors of the alloys were analyzed using different scanning calorimetry (DSC) and by measuring the resistivity, observation of fracture type and microstructure by scanning electron microscope (SEM) and transmission electron microscope (TEM), formability attained by bending test. The tensile test was performed to obtain the mechanical properties of the alloys. The results indicate that the bending ability of 6022,6111 alloys with different chemical compositions,solution temperature,cooling rate after solution and low temperature aging is good, and they have high elongation. 6N01 alloys with lower strength and higher elongation can get better formability. Low re-heating temperature increases bending ability.6N01PB,6N01PS,6N01PM alloys pre-aged for -10~30℃ for long time will have negative effect after artificial aging, but positive effect for 50~70℃.
    顯示於類別:[機械工程研究所] 博碩士論文

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