共查询到19条相似文献,搜索用时 125 毫秒
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采用"沉降法"和"过滤法"对富铁铝合金进行复合净化,实验得出了其最佳工艺方法.结果表明:采用复合净化法可有效地去除铝合金中富铁化合物,净化后合金的机械性能明显改善,且对合金无副作用。 相似文献
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《特种铸造及有色合金》2017,(12)
研究铝合金熔体净化方法对提高电工用铝合金杆的质量具有重要意义。净化方法有吸附净化、非吸附净化和复合净化3类,综述了电工用铝合金熔体净化方法研究应用现状及进展。其中吹气法、熔剂法、过滤法、超声波净化法、电磁净化法等方法的研究应用成果较多,以追求高效便捷为目标的复合净化方法正成为该领域关注的热点。 相似文献
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《特种铸造及有色合金》2006,26(12):767-767
诺威力斯公司宣布,经过多年的研究开发.该公司的诺威力斯复合锭铸造法已开始进行商业化大规模生产。此法可以铸造芯层为一种铝合金而表层为一种或多种合金的多层复合优质锭.这也是复合锭首次实现商业化生产、权威专家认为.诺威力斯复合锭铸造法是继上世纪30年代铝合金半连续铸造法诞生以来在铝合金工业化铸造工艺方面的又一次重大突破。 相似文献
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稀土合金具有变质、晶粒细化和净化铝合金的综合功能,而且对周围环境不产生任何污染。充分发挥稀土合金的特殊功能,形成一种绿色的复合变质细化和净化为一体的铸造铝合金熔体处理工艺,从源头上解决铸造铝合金熔体处理过程中的环保问题,为铸造铝合金绿色清洁集约化生产提供了一条可行之路。 相似文献
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采用复合强韧化工艺,对7A04铝合金的组织和性能进行了研究。结果表明,通过熔体净化、晶粒细化、强化均匀化、锻造及分级固溶处理能明显改善和提高7A04高强铝合金的综合性能,而且可以大大减少均匀化处理的保温时间。 相似文献
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利用热塑性试验研究了6005A铝合金的热裂纹敏感性,分析了激光-MIG复合热源焊接6005A铝合金型材的焊接热裂纹问题.热塑性试验结果表明,6005A铝合金的脆性温度区间为550~640℃,具有较高的热裂纹敏感性.利用激光-MIG复合焊,采用I形坡L1,可以在4.5m/min的焊接速度下实现6005A铝合金型材的高速焊接.获得的复合焊缝背面局部区域出现垂直于焊缝的热裂纹.热裂纹产生的原因是由更改坡口后致使焊缝金属中母材的稀释率增大引起的,采用适当角度的V形坡口可以消除激光-MIG复合焊中的热裂纹. 相似文献
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通过小型铝合金熔体的脱氢实验,研究了旋转喷枪微气泡净化法的脱氢规律。实验表明旋转喷枪转速、氩气流量、净化处理时间和喷枪埋入深度是影响铝合金熔体脱氢效果的主要因素。在铝合金熔体微气泡法处理时,存在一个最佳的氩气流量.氩气流量偏离这个最佳值对脱氢不利。随着旋转喷枪转速的增加,铝合金熔体的脱氢率也随之增加,并且逐步趋于平缓.净化处理时间超长,喷枪埋入熔体内越深,对脱氢越有利。获得理想的脱氢效果必须几个因素相互协调。在实验过程中,已经能够在10分钟内将铝合金熔体中的氢含量从0.32ml/100gAl,降低至0.075ml/100gAl说明铝合金熔体微气泡净化法具有良好的脱氢效果。 相似文献
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P. Wenschot 《International Journal of Cast Metals Research》2014,27(2):65-72
Castings made of copper–nickel–aluminium bronze (CuAl10Fe5Ni5) alloys regularly show defects in the thick, slowly solidifying parts of the castings, which give rise to rejections. Metallographic examination has been made on material of scrap castings showing porosity accompanied with film-like inclusions located beside the iron rich κII phases. Investigations of large failed cast structures of copper–nickel–aluminium bronze show the same characteristic defects on which fatigue cracks initiate and grow. Investigation has been made to the nature and the cause of appearance of the film-like inclusions. Microanalysis indicates a high intensity of carbon at the place of the film-like inclusions. Hereafter, an investigation has been made into the solubility of carbon in liquid copper–nickel–aluminium bronze, and it is found that besides hydrogen, also carbon is soluble in copper–nickel–aluminium bronze alloys. The appearance of the carbon as flakes in the fracture surface of materials with defects does suspect there is a nucleating effect on the formation of microporosity causing the defects. To prevent the formation of the casting defects by the interaction between solved hydrogen and carbon, it is necessary to remove the carbon as far as possible by treatment of the melt. 相似文献
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铝基复合材料镶嵌铸造工艺 总被引:1,自引:0,他引:1
研究了在铝合金铸件中镶嵌铝基复合材料的镶嵌铸造工艺,并通过镶嵌件表面处理(喷砂、镀锌、镀镍)和控制浇注工艺参数(铸模温度、镶嵌件预热温度、铝合金浇注温度和浇注操作时间)获得了复合材料镶嵌件和铸件本体铝合金之间良好的界面结合 相似文献
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Zr元素在超高强铝合金中的应用可以追溯到B96铝合金,Zr元素已成为超高强铝合金中不可缺少的微量元素。本实验分别采用Al-Zr中间合金、氟锆酸钾和复合锆盐3种工艺加入Zr元素,研究了熔炼温度对Zr元素收得率和凝固组织的影响,熔炼温度及加入工艺对Zr元素存在形式的影响。结果表明:采用复合锆盐加入法,Zr元素的收得率最高,细化效果最好。在750 ℃采用Al-Zr中间合金加入法,试样中含Zr相较为粗大,组织细化效果不好 相似文献
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铝锂合金是密度较小、强度较刘,且具有可焊接特性的新型先进铝合金宇航结构材料。通过超声检测,发现了铝锂锻件与铝合金超声特性的差异。试样解剖证实了该系合金锻件内存在不同形式的夹杂物,主要呈线状或条状分布。 相似文献
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介绍了用DV-4光电光谱仪对8006铝合金中高含量元素Fe及其共存元素全分析的试验过程。通过选取制备适宜的国家标样、双点标准化控样,对分析条件进行最佳选择及工作曲线的校正,样品激发部位的确定而制定的分析方法,可取代化学法分析Fe,且常量成分能同时测定。 相似文献
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This work is focused on the role of intermetallics in pitting corrosion of Al2219 alloy. Second phase particles were characterized by AES, SAM and EDX. Their behaviour in a solution of NaCl was investigated as a function of exposure time. The results confirmed the cathodic nature of the intermetallics with respect to the aluminium matrix. Corrosion products rich in aluminium and oxygen were found to progressively accumulate around the particles and iron was dissolved from the intermetallic, followed by back-deposition. Copper and manganese did not show any major activity. After 32 h of exposure the larger intermetallics were completely covered. 相似文献
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S. Babu K. Elangovan V. Balasubramanian M. Balasubramanian 《Metals and Materials International》2009,15(2):321-330
AA2219 aluminium alloy (Al-Cu-Mn alloy) has gathered wide acceptance in the fabrication of lightweight structures requiring
a high strength-to-weight ratio and good corrosion resistance. In contrast to the fusion welding processes that are routinely
used for joining structural aluminium alloys, the friction stir welding (FSW) process is an emerging solid state joining process
in which the material that is being welded does not melt and recast. This process uses a non-consumable tool to generate frictional
heat in the abutting surfaces. The welding parameters such as tool rotational speed, welding speed, axial force etc., and
the tool pin profile play a major role in determining the joint strength. An attempt has been made here to develop a mathematical
model to predict the tensile strength of friction stir welded AA2219 aluminium alloy by incorporating FSW process parameters.
A central composite design with four factors and five levels has been used to minimize the number of experimental conditions.
The response surface method (RSM) has been used to develop the model. The developed mathematical model has been optimized
using the Hooke and Jeeves search technique to maximize the tensile strength of the friction stir welded AA2219 aluminium
alloy joints. 相似文献
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电磁铆接试样质量分析 总被引:2,自引:0,他引:2
采用试验方法,通过电磁铆接和气动铆接方式,对铆接试样从铆钉宏观变形和微观连接方面进行质量对比分析。结果表明,与气动铆接相比,电磁铆接能一次成形,铆接试样钉杆变形均匀,波动度小,铆接质量稳定,不易出现钉头被铆歪、开裂等现象。在铆钉成形钉头与铝合金板连接处,电磁铆接铆钉变形较气动铆接剧烈。在铆钉钉杆与铝合金板连接处,电磁铆接试样铆钉与铝合金板连接的紧密程度要好于气动铆接。在铆钉钉杆与复合材料连接处,电磁铆接铆钉对复合材料的挤压程度要小于气动铆接,未出现复合材料分层和开裂。 相似文献