共查询到17条相似文献,搜索用时 171 毫秒
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中间合金对铝合金细化处理的现状分析与初探 总被引:32,自引:10,他引:22
分析讨论了中间合金对铝合金晶粒细化处理的研究与应用现状及其细化机理;并对新型细化剂AITiBRE中国合金的细化效果进行初探,结果表明该中间合金是一种高效、长效的晶粒细化剂,对压力罐用铝材具有显著的细化作用,其效果优于进口的A15TilB细化剂。 相似文献
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新型Al-Ti-B-稀土(RE)晶粒细化剂 总被引:8,自引:1,他引:8
Al-Ti-B-稀土是新近发展起来的用于铝合金的晶粒细化剂,与Al-Ti-B相比,它具有较为明显的细化晶粒效果,同时,还能明显改善中间合金Al-Ti-B中TiB2的聚集现象。当TiB2质点聚集成团块,特别是密集团块时,不但影响晶粒细化效果,而且还会严重影响到铝合金产品的质量。Al-Ti-B-稀土则避免了这种现象,针对这一特点,对其细化机理进行了研究,并简要说明了其使用效果及其应用。 相似文献
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晶粒细化是提高合金质量的重要途径之一,综述了用于铝合金晶粒细化的中间合金研究与应用进展,同时就其发展历史、分类和生产方法进行介绍,最后指明了铝合金晶粒细化剂的发展方向。 相似文献
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电解生产低钛铝合金的晶粒细化及衰退行为 总被引:3,自引:2,他引:3
选用Ti质量分数为0.1%~0.3%的电解低钛铝合金,分别研究了钛对合金晶粒的细化效果和熔体保温时间对晶粒细化的衰退行为的影响,并与相应含钛量熔配低钛铝合金进行了对比。结果表明,随着Ti含量的增加,两种加钛方式的低钛铝合金样品晶粒得到明显的细化。随着保温时间的延长,所有合金的晶粒尺寸均不同程度发生了粗化,Ti对晶粒的细化效果明显发生了衰退。电解加钛铝合金晶粒细化效果的抗衰退能力优于熔配加钛铝合金,这种趋势对Ti的质量分数为0.1%~0.2%的合金特别明显。 相似文献
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低钛铝合金的电解生产与晶粒细化 总被引:27,自引:3,他引:27
在电解低钛铝合金的工业化生产试验中,研究和对比了电解加钛和熔配加钛低钛铝合金的晶粒细化效果及其衰退行为。结果发现:电解质中添加少量TiO2对电解槽铝产量和电流效率影响较小,二者分别维持在1200kg和92%左右,钛的吸收率在95%以上所生产的合金钛含量稳定,晶粒细化效果明显,晶粒尺寸随钛含量的变化趋势与熔配加钛合金相同;钛含量在0.1%~0.2%范围内时,电解加Ti合金晶粒细化效果的抗退化能力比熔配加Ti合金的强。 相似文献
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For the grain refinement of super pure aluminium and commercial pure aluminium,Al-Ti-C master al-loy is better than Al-Ti alloy.It was shown by scanning electron microscope(SEM)and electron-probe mi-croanalyser(EPMA)that when the amount of titanium added is less than 0.15%,grain refinement of superpure aluminium is due to TiC particles rather than peritectic reaction.In addition,the presence of impurityelements in commercial pure aluminium plays an important role in grain refinement.The process of grain re-finement of aluminium by TiC is discussed in light of the TiC thesis. 相似文献
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Feng Wang Dong Qiu Zhi-Lin Liu John A. Taylor Mark A. Easton Ming-Xing Zhang 《Acta Materialia》2013,61(15):5636-5645
The mechanism underlying the grain refinement of cast aluminium by zirconium has been studied through examination of a range of Al alloys with increasing Zr contents. Pro-peritectic Al3Zr particles are reproducibly identified at or near the grain centres in grain-refined alloy samples based on the observations of optical microscopy, scanning electron microscopy and X-ray diffraction. From the crystallographic study using the edge-to-edge matching model, electron backscatter diffraction and transmission electron microscopy, it is substantiated that the Al3Zr particles are highly potent nucleants for Al. In addition, the effects of Al3Zr particle size and distribution on grain refinement has also been investigated. It has been found that the active Al3Zr particles are bigger than previously reported other types of active particles, such as TiB2 for heterogeneous nucleation in Al alloys. Considering the low growth restriction effect of Zr in Al (the maximum Q-value of Zr in Al is 1.0 K), it is suggested that the significant grain refinement of Al resulting from the addition of Zr can be mainly attributed to the heterogeneous nucleation facilitated by the in situ formed Al3Zr particles. 相似文献
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微量Sc和Zr对Al—Mg合金铸态组织的晶粒细化作用 总被引:32,自引:5,他引:32
制备了Al5Mg、Al5Mg0.2Sc、Al5Mg0.1Zr和Al5Mg0.2Sc0.1Zr四种铸态合金,采用金相显微镜和扫描电镜观察分析了微量Sc和Zr对AlMg合金铸态组织的晶粒细化作用及其机理。结果发现,02%的Sc并未使AlMg合金产生晶粒细化作用,而02%的Sc与01%的Zr复合添加则使AlMg合金产生了极其强烈的晶粒细化作用。这一作用的产生,是由于Sc、Zr与Al在合金熔体中生成了Al3Sc和Al3Zr复合粒子,这种粒子在合金凝固过程中,起到了非均质晶核细化晶粒的作用 相似文献