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设计了一种含少量Zn、Mn的Al-Cu-Li-Mg-Zr合金,并研究了其拉伸性能及微观组织。结果表明:该合金的主要析出相为6(Al5Cu6Mg2)相、T1(A12CuLi)相及θ′(A12Cu)相。160℃/18h时效时,随固溶温度升高,θ′相减少,6相和T1相含量增加,合金强度提高。530℃/1h固溶后,随时效温度升至175℃时,6相及T1相增加,合金强度增大;时效温度进一步升高至190℃,T1相减少,合金强度降低,且随时效温度升高,合金塑性降低,其断裂方式由韧性断裂逐渐转变为复合断裂。 相似文献
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针对板料电磁成形时,随着板料尺寸的不断变化,矩形线圈产生的电磁力分布也不相同的现象进行数值模拟分析及相关试验验证。分别对大尺寸板料及小尺寸板材(板料尺寸小于矩形线圈尺寸)的电磁成形力分布进行数值模拟,得到不同板料上的电磁力分布情况。进行小尺寸板料的电磁成形试验:在板材的尺寸大小、成形电压等均相同的情况下,通过改变板料相对线圈位置高度,得到小尺寸板料在不同位置时的成形效果。并结合数值模拟得出相关规律,确定了小尺寸板料电磁成形时的最优成形条件为:当板料处于矩形电磁线圈的两个电磁力峰值之间的位置时,即,当相对线圈位置高度l=7~13 mm时,板料的电磁成形效果最佳。 相似文献
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1Introduction Al-Li alloys,compared with traditional Al alloys,possess more excellent properties,such as lower density,greater elastic modulus and higher specific strength.In the near future,they would be widely applied in airplane structures.However,they… 相似文献
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陈文敬 《有色金属与稀土应用》2008,(4)
通过测量动电位极化曲线、电化学阻抗谱(EIS),并结合SEM研究恒应力作用下2195Al-Li合金在3.5%NaCl溶液中的腐蚀行为。结果表明,应力增加,材料腐蚀加剧;合金主要腐蚀类型为晶间腐蚀和孔蚀,是由于合金的主要时效强化相为晶内析出的T1(Al2CuLi)相,T1相与基体合金相互交替作为阳极相发生溶解,加速了合金孔蚀;同时晶界处析出粗大的平衡相T2(Al6CuLi3)相,T2相相对周围PFZ为阳极相发生溶解,导致合金发生晶间腐蚀。 相似文献
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The influence of two novel aging treatments, T616 (130 ℃, 80 min + 65℃, 240 h+130℃, 18 h) and high-temperature pre-precipitation(HTPP) aging (445℃, 30 min+120℃, 24 h) on the tensile properties, intergranular corrosion, exfoliation corrosion behaviors and microstructures of 7075 AI alloy was studied, which were compared with the T6, T73 and RRA treatments. Fine η' precipitate with high density was obtained in the alloy with the T6 and RRA treatments. The η' precipitate density in the HTPP aged alloy is decreased due to the formation of coarse particles during the pre-precipitation process at high temperature of 445℃. The 7075-T616 alloy possesses higher precipitate density and whole precipitate volume fraction within the grain than the 7075-T73 alloy, and its whole precipitate volume fraction is even greater than that of the 7075-T6 alloy. Compared with T6 treatment, the RRA, T73, T616 and HTPP aging treatments cause the discontinuous distribution of the η precipitates at the grain boundary, which decreases the intergranular corrosion and exfoliation corrosion susceptibility of the alloy. Meanwhile, the T616 and RRA treatments can keep the high strength of the 7075 AI alloy, but the studied HTPP aging and T73 treatments lower its strength. 相似文献
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Ni-SiC复合镀层电结晶初期动力学分析 总被引:1,自引:0,他引:1
利用循环伏安方法和恒电位阶跃技术研究Ni-SiC复合镀层电沉积行为。结果表明:Ni-SiC复合镀层和纯Ni镀层的形核/生长过程符合Scharifker-Hill三维成核模型;在低过电位下,Ni.SiC复合镀层形核/生长过程按三维连续成核机制;高过电位下,形核/生长过程遵循瞬时成核机制,与纯Ni镀层的形核/生长过程具有一致性;无论Ni-SiC复合镀层还是纯Ni镀层,形核弛豫时间‰随负电位的增大呈现有规律递减趋势,相应的厶值基本相近;SiC粉体的引入导致Ni形核的过电位正移和‰的显著减小。 相似文献
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通过动电位极化曲线、电化学阻抗谱,并结合SEM图,研究恒应力作用下1420Al-Li合金在3.5%NaCl溶液中的腐蚀行为.结果表明:随着应力增加,材料的腐蚀加剧;合金主要腐蚀类型为孔蚀,这是由于合金的主要时效强化相为δ’相(Al3Li),它作为阳极相均匀弥散分布在基体中,晶界处仅有少量的S(Al2MgLi)相. 相似文献
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