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通过航天常用铝合金2A12,3A21,5A06和6063焊接工艺试验,分析对比各铝合金的焊接性,并进行焊缝质量检验,测试焊接接头力学性能以及分析接头显微组织。结果表明,5A06的焊接性最优,2A12铝合金焊接性最差;均为退火态时,5A06铝合金的焊缝强度最高,而3A21铝合金的焊缝强度最低。 相似文献
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通过分析4043与5A06铝合金化学成分、物理性能和焊接性特点,并在工程实践的基础上,总结了4043与5A06铝合金焊接技术要点及焊接工艺差异,为生产和生活中铝合金焊接技术提供了有益的技术参考,同时也为铝合金焊接技能提供了宝贵的经验借鉴。 相似文献
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吴华 《热处理技术与装备》2011,32(2)
本文在室温大气环境下,对5A06铝合金焊接接头进行了对称载荷疲劳试验,并采用扫描电镜对疲劳断口形貌进行了观察与分析,研究了5A06铝合金焊接接头疲劳性能.试验结果表明其疲劳条带为延性疲劳条带;断口微观形貌均呈韧性穿晶型断口特征.5A06铝合金焊接接头具有较好的塑性,但是接头内部的夹杂相受低温的影响而脆性增大. 相似文献
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为了解决5A06铝合金热轧过程中的断裂行为,采用半连续铸造的5A06铝合金铸锭进行不同开坯温度热轧,肉眼观察铸锭轧制过程中的断裂行为,采用扫描电镜、光学显微镜进行断口观察,为了进一步观察断口晶体学特点,采用混合酸进行了侵蚀。研究表明,5A06合金在高温轧制时,容易产生断裂,断口表现为解理和沿晶混合型。进一步研究发现,微量元素Na对5A06合金的断裂行为有显著的影响。Na含量较低时合金热轧塑性很高,热轧过程中很少有断裂情况发生;而Na含量较高时则易发生脆性断裂。研究了减少半连续铸造5A06铝合金铸锭中Na含量的措施。 相似文献
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《锻压技术》2020,(8)
采用热模拟实验机对5A06铝合金进行了变形温度为300,350,400,450和500℃,应变速率为0. 01,0. 1,1和10 s-1不同热变形条件下的等温压缩实验,分析了变形温度和应变速率对5A06铝合金热变形行为的影响,基于实验数据建立了5A06铝合金的Johnson Cook初始本构模型,并在此模型基础上进行了修正。研究结果表明:5A06铝合金热压缩时的热变形应力与变形温度、应变及应变速率均有关,热变形应力随着应变的增大先快速增大,然后逐步减小直至稳定,随变形温度的升高而降低,随应变速率的增大而增大;与Johnson Cook初始本构模型相比,修正后的本构模型具有更高的预测精度,更能准确地表达5A06铝合金热变形应力与热变形条件之间的关系。 相似文献
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研究了加工率、稳定化退火温度及保温时间对板材组织与性能的影响,确定了5083铝合金H321状态板材的生产工艺。结果表明。其性能指标达到ASTMB209标准的规定。 相似文献
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In this study, cerium and lanthanum chloride binary mixtures conversion coatings were investigated as corrosion inhibitors for silicon carbide particulates reinforced AA5A06 aluminium composite and AA5A06 aluminium alloy. Electrochemical impedance spectroscopy and potentiodynamic polarization tests revealed that cerium (III) chloride additions markedly improved the pitting corrosion resistance as compared to lanthanum (III) chloride additions, with maximum increase noted for samples treated with 750 ppm cerium (III) + 250 ppm lanthanum (III) chlorides. Scanning electron microscopy, energy dispersion spectroscopy and X‐ray photoelectron spectroscopy examinations revealed the existence of a heterogeneous layer formed by precipitation of cerium/lanthanum oxide/hydroxide on the cathodic intermetallics and an aluminium oxide film on the rest of the metal matrix. Improved corrosion resistance was attained for SiC particulates reinforced aluminium composite by means of the cerium/lanthanum conversion treatment, due to the presence of mainly cerium (IV) species as a result of oxidation of cerium (III), which provides auto‐protection properties. 相似文献
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Chengcong Zhang 《Science & Technology of Welding & Joining》2018,23(5):394-399
The longitudinal residual stresses in the friction stir-welded plates of 5A06 aluminium and pure copper were determined using the contour method. The results revealed the presence of high tensile and compressive residual stresses on the aluminium and copper sides, respectively. The residual stresses were detected on the weld zone as well as the thermo-mechanically affected zone (TMAZ) of the aluminium plate. In contrast, the compressive residual stresses in the copper plate had a much narrower width along the weld line. Peak tensile stresses up to 240?MPa were found in the TMAZ of the aluminium plate. 相似文献