Element segregation behavior of aluminum-copper alloy ZL205A

来源 :China Foundry | 被引量 : 0次 | 上传用户:zzj0926
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
In aluminum-copper alloy, the segregation has a severe bad effect on the alloying degree, strength and corrosion resistance. A deeper understanding of element segregation behavior will have a great signif icance on the prevention of segregation. In the study, the element segregation behavior of ZL205 A aluminum-copper alloy was investigated by examining isothermally solidifi ed samples using scanning electron microscopy and energy dispersive spectroscopy. The calculated results of segregation coeffi cients show that Cu and Mn are negative segregation elements; while Ti, V and Zr are positive segregation elements. The sequence of element segregation degree from the greatest to the least in ZL205 A alloy is Cu, Mn, V, Ti, Zr and Al. The density of residual liquid is expected to increase with a decrease in the quenching temperature ranging from 630 ℃ to 550 ℃. The calculated results conf irm that the quenching temperature has an insignif icant effect on the liquid density; and the variation of density is mainly due to element segregation. Consequently, segregations of Al, Cu and Mn lead to an increase in density, but Ti, V and Zr present the opposite effect. The contribution of each element to the variation of the liquid density was analyzed. The sequence of contributions of alloying elements to the variation of total liquid density is Cu>Al>Mn>V>Ti>Zr. In aluminum-copper alloy, the segregation has a severe bad effect on the alloying degree, strength and corrosion resistance. A deep understanding of element segregation behavior will have a great signif icance on the prevention of segregation. In the study, the element segregation behavior of ZL205 A aluminum-copper alloy was investigated by examining isothermally solidifi ed samples using scanning electron microscopy and energy dispersive spectroscopy. The calculated results of segregation coeffi cients show that Cu and Mn are negative segregation elements; while Ti, V and Zr are positive segregation elements. The sequence of element segregation degree from the greatest to the least in ZL205 A alloy is Cu, Mn, V, Ti, Zr and Al. The density of residual liquid is expected to increase with a decrease in the quenching temperature ranging from 630 ℃ to 550 ℃. The calculated results irm that the quenching temperature has an insignificant effect on the liquid density; and the var The contribution of segregations of Al, Cu and Mn lead to an increase in density, but Ti, V and Zr present the opposite effect. The contribution of each element to the variation of the liquid density was analyzed. The sequence of contributions of alloying elements to the variation of total liquid density is Cu> Al> Mn> V> Ti> Zr.
其他文献
为优化化工企业生产计划,本文建立了化工过程生产计划优化的混合整数非线性规划(mixed integer nonlinear program- ming)模型,并给出相应的迭代求解算法,实际应用表明该算法
存款保险制度是维护金融安全的重要防线,金融危机的数次挑战和国外实施的成功经验都强有力地证明了建立存款保险制度的必要性和有效性.因此,无论是站在保护存款人利益的立场,
本文从人才资源在经济增长中的重要作用入手,对曹妃甸工业区人才发展建设面临的诸多宏观制约因素进行了深入分析,并从政府如何更好地提供人才服务提出了若干操作性较强的对策
目的:分析暹罗鳄鱼肉与鱼肉、鸡肉、猪肉中蛋白的差异,找出鳄鱼肉特异蛋白。方法:采用电泳缓冲液匀浆鳄鱼肉、鱼肉、鸡肉和猪肉,反复冻融5次后,得到4种动物肉匀浆液,采用十二烷基磺
Wear is a major factor of disc cutters’ failure. No current theory offers a standard for the prediction of disc cutter wear yet. In the field the wear predicti
The effects of Co addition on the microstructure,crystallization processes and soft magnetic properties of(Fe1 xCox)83Si4B8P4Cu1(x?0.35,0.5,0.65)alloys were inv
The joining of aluminum alloy sheets with thickness less than 2.0 mm is difficult via conventional friction stir welding owing to the defects in the joint, such
The behaviors of YAG laser welding process of ferritic stainless steel with activating fluxes were investigated in this study. Some conventional oxides, halides
中学校园暴力事件近几年呈上升趋势,已成为一大社会问题.中学校园暴力案频发的原因是多层次多方面的,其中有学生自身的主体原因,又有社会、家庭、学校等外部原因.所以,防治校