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Al—Zn—Mg—Sc系热强可焊铝合金 总被引:4,自引:0,他引:4
将钪加入Al-Zn-Mg系合金中,可显著改善该系合金的许多重要的技术特性和使用性能。01970和01975合金就是在Al-Zn-Mg系基础上发展起来的高强可焊热强铝合金。不含钪的Al-Zn-Mg系合金尽管含有多种过渡金属元素锆和钛,以及铜,并使锌和镁的成分最佳比,各含2.6%,从而使合金的可焊性增强,但由于铜的加入,使合金焊接时生成裂纹的倾向增大了。采用添加钪元素后,将使由铜引起的焊接裂纹倾向完全消失。由于采用钪合金化元素,还进一步保证了晶粒的细化,保证了该合金系即使在铜含量处于高位时,也具有较高的抗焊接热裂纹特性。现将01970和01… 相似文献
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Al-Zn-Mg系为成功地发展用于可活动轻便桥梁、铁道和地铁客车车厢、轿车、卡车车身、低温设备和电线杆的结构材料合金提供了基础。高的比强度、可用多种工艺成形、优良的焊接性能、对腐蚀的防护措施要求很低和容易搬运,使人们对Al-Zn-Mg系合金非常感兴趣。扩大它在各种各样工程中的用途,已经 相似文献
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Al-Zn-Mg系及Al-Zn-Mg-Cu系合金虽已荻得了广泛的应用,但目前,各个主要国家对它们的化学成份、加工工艺、机械性能、焊接性能、断裂韧性、热处理机理等,仍在进 相似文献
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本文介紹了不經事先固溶热处理可时效硬化的Al-Zn-Mg系新合金(4~5% Zn、0.5~2.0%Mg)。这意味着此系合金焊接后的机械性能以簡单的室温时效便可得到恢复。 相似文献
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Al-Zn-Mg合金的Zn+Mg含量对其性质的影响较大。7003合金的Zn=和Mg含量范围较宽。当Zn+Mg含量增加时,机械性能提高而焊接性能和抗蚀性能降低。 相似文献
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用测定硬度方法、X 射线小角度散射法及透射电子显微镜对 Al-4.5%Zn-1.2%Mg、Al-3%Zn-3%Mg 及 Al-2%Zn-4%Mg 合金的焊缝时效特性进行了研究。Al-Zn-Mg 系合金的镁含量越高,焊后的焊缝硬度值就越高。将焊缝在室温下或40℃下时效,其硬度值和 G.P.区体积分数,随着锌在 Al-Zn-Mg 系合金中含量的提高而增加。另一方面,在135℃下时效时,高镁含量的 Al-Zn-Mg 系合金具有较高的硬度值。冷却速度对 Al-3%Zn-3%Mg 和 Al-2%Zn-4%Mg 合金焊缝时效特性的影响较 Al-4.5%Zn-1.2%Mg 合金明显。 相似文献
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《中国有色金属学报》2017,(12)
采用金相、硬度、电导率、剥落腐蚀、电化学腐蚀以及透射电镜(TEM)观察等分析测试方法研究焊后热处理对Al-Zn-Mg合金组织与性能的影响。结果表明:Al-Zn-Mg合金焊接接头固溶区的硬度和耐腐蚀性能随焊后热处理时效时间的延长和温度的提高而提升。自然时效4 d+(130℃,24 h)和自然时效150 d+(150℃,2 h)两种焊后热处理工艺较佳:经自然时效4 d+(130℃,24 h)处理后,合金固溶区最大硬度由82.5HV提高至123HV,最大电导率由34%IACS提高至35.8%IACS,剥蚀等级提升至EA;经自然时效150 d+(150℃,2 h)处理后,合金固溶区最大硬度提高至110HV,最大电导率至34.7%IACS,剥蚀等级提升至N。合金焊接接头固溶区硬度与耐腐蚀性能提升的主要原因是焊后时效热处理促进焊接固溶区晶内析出相粗化,弥散分布,且晶界析出相呈不连续分布状。 相似文献
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In this study, fatigue properties and fracture mechanism of dissimilar Al–Mg–Si/Al–Zn–Mg aluminum alloys friction stir welding(FSW) joints were investigated and the effect of the sheet configuration on the fatigue behavior of the FSW joints was also discussed. Results showed that the joints owned better fatigue properties when the Al–Zn–Mg aluminum alloy was placed at the advancing side(AS). At 10~7 cycles, the fatigue strengths of Al–Zn–Mg–AS and Al–Mg–Si–AS joints were, respectively, 105.6 and 90.1 MPa. All joints fractured at the heat-affected zone at the Al–Mg–Si alloy side. Transmission electron microscopy results showed that better fatigue property of the Al–Zn–Mg–AS joint was associated with the bridging effect of the bigger secondary phase particles. 相似文献
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采用慢应变速率拉伸试验、扫描电镜断口观察和透射电镜晶界微观结构观察及析出相统计等方法,研究了两种晶粒尺寸的Al-Zn-Mg铝合金在3.5%(质量分数)NaCl溶液(pH=6)中的应力腐蚀行为。结果表明:晶粒度大的Al-Zn-Mg铝合金的应力腐蚀敏感性比晶粒度小的合金要高;透射电镜的统计观察分析表明,小晶粒度小的合金的晶界析出相覆盖率高于大晶粒度合金的晶界析出相覆盖率。在一定的晶界析出相面积范围之内,析出相面积分数高的Al-Zn-Mg合金应力的腐蚀敏感性小于析出相面积分数低的Al-Zn-Mg合金。 相似文献
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《Science & Technology of Welding & Joining》2013,18(6):352-361
AbstractThe present study is concerned with gas tungsten arc welding of two high strength aluminium alloys, namely, an Al-Zn-Mg alloy (RDE 40) and an Al-Li based alloy of Russian grade 1441. One of the critical requirements of these two alloys is that they should be weldable. In the present work, weldability aspects of these alloys were studied in terms of solidification cracking tendency, microstructure, tensile properties, and microhardness across the welds. These studies were extended to dissimilar welds between RDE 40 and 1441 produced via conventional gas tungsten arc (GTA) welding as well as pulsed current GTA welding. It was found that RDE 40 welds were less sensitive to solidification cracking and weld metal porosity compared with 1441 alloy. The superior weldability of RDE 40 was related to the equiaxed nature of the fusion zone and a lower sensitivity to moisture pickup. It was possible to produce RDE 40-1441 welds without defects. Pulsed current welding of RDE 40 to 1441 showed improved mechanical properties compared with conventional GTA welding, and these were related to the refinement of the fusion zone microstructure. 相似文献
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The effects of Mn dispersoid and fabrication methods on the fracture toughness in peak aged Al-Zn-Mg-(Mn) alloys have been studied. Sphere- or rod-shaped Mn dispersoids of the size in range from 0.05 μm to 0.5 μrn are formed by the addition of Mn in Al-Zn-Mg alloy. The extruded alloys containing Mn have higher fracture toughness with higher strength and show transgranular ductile fracture surface. as compared with those of Al-Zn-Mg alloy. These phenomena are found to be obtained from the improved load bearing capacity and the effective accommodation of the applied stress due to the dispersion hardening effect and homogeneous deformation by the Mn-dispersoids. Comparing the mechanical properties between the extruded and the rolled alloys containing 0.8 wt% Mn. the extruded alloy is shown to have higher strength and better fracture toughness than those of the rolled one. This result can be explained by the dispersion of stress concentration and the improved homogeneous deformation attributed to the fine grain structure and the existence of deformation texture for the extruded alloy. 相似文献
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通过光学显微镜、扫描电镜、透射电镜观察以及拉伸试验等手段,研究Cr、Mn、Zr微合金元素对Al-Zn-Mg合金组织和性能的影响。结果表明:复合添加Zr、Mn、Cr在基体上析出大量不规则的、直径为10~20 nm与基体共格的(Al,Cr)3Zr粒子。(Al,Cr)3Zr粒子弥散相能强烈钉扎位错、阻碍位错和亚晶界迁移,显著抑制再结晶和晶粒长大。复合添加Zr、Mn、Cr的Al-Zn-Mg合金的抗拉强度和规定塑性延伸强度分别提高34 MPa、19 MPa,具有较好的加工性能和力学性能。 相似文献
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