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目前,国外已普遍由采用中间合金过渡到采用铝合金添加剂的方法熔炼铝合金[1].本文试生产用的铝合金添加剂为中国科学院金属研究所研究成功的熔炼铝合金新型辅助材料,先后经华益铝厂、沈阳铝材厂和仪征有色金属材料厂多次用于铝合金熔炼,调整合金化学成分取得了良好效果.该产品达到英国Foseco公司同类产品水平. 相似文献
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简述了变形铝合金产品粗大金属间化合物缺陷的形成机理、形貌特征与危害,例举了采用超声波无损检测技术探测变形铝合金产品粗大金属间化合物缺陷的案例,并对检测结果的准确性进行了剖伤验证、定性分析。 相似文献
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采用扫描电镜、金相显微和电化学测试等综合评价技术研究7A09铝合金在3.5% NaCl(质量分数)水溶液中的腐蚀和电化学行为。结果表明:7A09铝合金不均一的显微组织结构导致该合金遭受严重的点蚀和晶间腐蚀,其中点蚀主要发生于金属间化合物或其周围,而沿晶界分布的阳极贫铜区的优先溶解是引起晶间腐蚀的主要原因。当不同浸泡时间时,在7A09铝合金表面交替进行着不同钝化膜的生成与溶解过程,并伴随着该合金钝化与去钝化行为的发生。同时,对该合金的腐蚀过程及机制进行分析。 相似文献
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Al—Ti和Al—Zr中间合金组织遗传性对铝合金铸造组织的影响 总被引:4,自引:1,他引:3
评述了Al-Ti和Al-Zr中间合金中金属间化合物尺寸、弥散度以及铝合金中Ti、Zr加入的质量分数对铝合金铸锭晶粒细化效果的影响。介绍了细晶中间合金的生产方法。 相似文献
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The corrosion behavior of 7A09 alloys exposed to an industrial atmosphere for 36 months was studied by weight loss method, morphology observation, electrochemical method, and loss in mechanical properties. Under the condition of exposure to an industrial atmosphere, the 7A09 alloy suffers obvious pitting corrosion and intergranular corrosion (IGC), and a charge transfer process controls the corrosion reaction. The corrosion rate presents a decreasing tendency with exposure time, which is mainly due to the enhancement of the protective ability of the corrosion product layer. The occurrence of IGC of this alloy is mainly caused by the preferential dissolution of the grain boundary precipitates Mg(ZnAlCu)2 and the precipitate-free zone along grain boundaries, and which leads to the reduction of the mechanical properties. In addition, the morphology and composition of the corrosion product layer were identified, and the corrosion mechanism was also discussed. 相似文献
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The susceptibilities of the three aluminum alloys to solidification crack were studied with trans-varestraint tests and tensile tests at elevated temperature. Their metallurgical characteristics, morphologies of the fractured surface and dynamic cracking behaviors at elevated temperature were analyzed with a series of micro-analysis methods. The results show that dynamic cracking models can be classified into three types. The first model has the healing effect which is called type A. The second is the one with deformation and breaking down of metal bridge, called type B. The last one is with the separation of liquid film along grain boundary, called type C. Moreover, the strain rate has different effects on crack susceptibility of aluminum alloys with different cracking models. ZL101 and 5083 alloys belong to type A and type C cracking model respectively, in which strain rate has greater effect on eutecfic healing and plastic deformation of metal bridge. 6082 alloy is type B cracking model in which the strain rate has little effect on the deformation ability of the liquid film. 相似文献
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利用CTS试样,研究了A7N01P-T4铝合金母材在I-II型复合加载下,不同加载角度时疲劳裂纹的扩展行为,利用有限元数值计算复合加载下裂纹尖端的应力强度因子(SIF, stress intensity factor)得到了加载角度与裂纹开裂方向的关系,并与由最大周向应力准则导出的关系进行了对比,二者吻合良好;根据疲劳试验和有限元计算的结果,并引入当量应力强度因子,分析了不同加载角下疲劳裂纹的扩展速率. 结果表明,经当量化处理后,各加载角下的裂纹扩展速率曲线基本重合,并且满足Paris公式. 相似文献