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耐热铝合金及其热稳强化相 总被引:10,自引:0,他引:10
本文对快速凝固耐热铝合金的研究进展做了最新综合评述,首先讨论了耐热铝合金的主要特征,然后着重从结构.点阵参数,以及在铝合金中形貌特点、粗化率等方面对较成熟的耐热铝合金中热稳定强化相进行评述. 相似文献
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Crystallization process in rapidly solidified AI-Nd-Ni amorphous alloy prepared by melt spinning 总被引:1,自引:0,他引:1
Rapidly solidified ribbons of Al90Nd7Ni3 metallic glasses were prepared by using melt spinning. Crystallization process of the totally amorphous ribbons was investigated by differential scanning calorimetry and X-ray diffraction analysis, under continuous heating regime. The results show that, under continuous heating regime, the metallic glass devitrifies via two main stages: primary crystallization, resulting in two-phase mixture of a(Al) plus residual amorphous phase, and secondary crystallization, corresponding to some inter-metallic phases appearing,successively including A111 Nds, Als Ni, and some unknown phases, in the AI amorphous/crystal matrix. Four peaks appear on the continuous heating DSC curves. Their peak temperatures are respectively 470.8, 570.8, 585.6, and 731.6 K at infinitesimal heating rate, and their activation energies of the respective phase transformation are 183.0,294.7, 232.5 and 269.1 kJ/mol. The values of Avrami exponent of the four reactions decrease with increasing relative transformation degree. At the earlier stage of phase transformation, the values of n are larger than 4, and at the later stage the values of n become close to some value from 0.5 to 2.0. 相似文献
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Precipitated phases and thermodynamic analysis during solidification of Al-Fe-X system at slow cooling rate 总被引:4,自引:0,他引:4
1 INTRODUCTIONItisanimportantcharacteristicsthattherearelotsofexcellentthermalstablephasesinrapidsolidi fiedheatresistantAlalloys[16 ] .Strengtheningphas esinthesealloysmusthave goodstabilizationofstructureandheat resistance .IntheheatresistantAlalloys,thereismutualinteractionbetweenthealloyelementsandAlmatrix ,whichyieldsdifferenteffectsonthemicrostructuresand properties .Generally ,someaddingelementswithlowdiffusioncoefficientandlimitedsolidsolutioninthealuminiumcanformintermetallicco… 相似文献
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新型铝合金微观组织对电化学性能的影响 总被引:1,自引:0,他引:1
用金相显微镜、扫描电子显微镜观察了新型铝合金的微观组织和表面形貌 ,用电化学方法研究了材料的电化学性能 ,用排水法收集氢气 ,评价了新型铝合金自腐蚀速率 相似文献
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采用金相、透射电镜、硬度测量、拉抻试验等手段,研究了添加Sc对2618铝合金轧制板材生产工艺过程中组织性能的影响。结果表明,添加适量的Sc明显改善了2618合金组织,使之细化、稳定化,提高了合金强度和塑性。但是加入过量的Sc,反而不利于改善合金组织性能。添加适量的Sc改善2618合金性能主要归因于铝基体上析出细小弥散的共格相Al_3Sc,该质点起着强烈的沉淀强化作用,还可以明显细化主要强化相s′相。 相似文献
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喷射沉积耐热铝合金AA8009的焊接技术是该合金实用化中必须解决的关键问题之一.试验采用ER5356、ER4043和母材作为焊丝对合金成分(质量分数,%)为Al-8.52Fe-1.23V-1.6Si、板厚为2 mm的耐热铝合金AA8009进行钨极氩弧焊焊接.结果表明,采用三种不同焊丝对耐热铝合金AA8009进行钨极氩弧焊焊接,断裂发生在熔化区边界,采用ER5356作为焊丝时焊接系数最高,为52.6%.焊缝冷却速度约为20℃/s,焊缝凝固组织为平衡或近平衡组织,在熔化区边界有针状析出相,热影响区及熔化区均发生了不同程度的软化. 相似文献
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金属纤维行业发展趋势 总被引:1,自引:0,他引:1
文章在介绍金属纤维生产工艺、应用领域的基础上,分析了金属纤维行业在美国、比利时、日本、中国的产业化现状,提出了金属纤维在汽车尾气颗粒捕集器、燃气红外燃烧器、导电塑料、金属纤维织物等方面广阔的发展前景。 相似文献
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