铝硅中间合金熔炼工艺的探讨

<正> 我厂长期来生产Z1102、Z1105合金,但由于铝硅中间合金的熔炼工艺不过关,造成零件大量报废。     

铝-钪中间合金中钪元素含量的分析

用盐酸溶解铝-钪中间合金试样,在一定酸度范围内,以二甲酚橙为指示剂,用乙二胺四乙酸二钠标准溶液滴定,测量铝-钪中间合金中的钪含量。结果表明,该方法测量准确性好,所用试剂、仪器较少,步骤比较简单,适宜用来测定铝-钪中间合金中的钪含量。     

高导电铝硅合金的研究进展

铝硅合金具有很多优良的性能,具有广阔的应用前景。本文总结了影响铝硅合金导电性的因素,分析了变质工艺、热处理及过程的控制对提高铝硅合金的导电率的作用,并对其以后的研究和发展方向进行了展望。     

硅含量对新型铝锡硅合金摩擦磨损性能的影响

借助环－块式摩擦磨损试验机,在干摩擦及油润滑状态下,研究了含Ｓｉ量１％－５％的新型Ａｌ－１０Ｓｎ－Ｓｉ三相合金及传统的Ａｌ－２０Ｓｎ两相合金的摩擦磨损２性能及行为。     

高铝铝硅合金作皮江法炼镁还原剂的探讨

提出用电热法炼铝产出的高铝铝硅合金作皮江法炼镁的还原剂。由于其成本较低,还原白云石产出的镁蒸气压较高,因而比硅铁和铝作还原剂具有更多的优点。对几种还原剂进行比较,对高铝合金生产的可行性进行了论述,并进行了高铝合金还原煅烧白云石的理论计算。     

用铍试剂Ⅲ光度法测定铝-铍中间合金中铍含量

提出了用铍试剂Ⅲ光度法测定铝-铍中间合金名铍含量的一种简便快速的方法,可供生产中使用。     

高导电性铝硅合金及其生产工艺

对影响铝硅合金导电性的工艺因素进行了研究。降低合金的钛、镁含量或变质处理均能够提高合金的导电性;晶粒细化处理降低合金的导电性;固溶处理显著降低合金的导电性;时效处理对导电性的影响不大。采用专门的热处理工艺,可使铝硅合金的电导率达到４１％ＩＡＣＳ以上,满足了输变电开关设备对铝合金性能的特殊要求     

摩托车铝-硅合金车轮的生产方法

研制了铸造铝－硅合金并应用于生产摩托车车轮。通过生产实践表明：该合金成分简单,成本低,熔化及净化工艺易行,力学性能达到３ＱＣ／Ｔ２９１１７·１５－９３标准的要求。     

高硅中间合金制备材料及工艺的优化

采用不同设备、不同工艺制备Mg-Si、Al-Si中间合金,对其进行分析、研究.结果表明,采用中频感应真空熔炼法、选用Al-Si材料制备的中间合金含硅质量高,能很好地满足制备高硅镁合金的要求.     

铝硅合金生产能耗分析

将电热法和兑掺法生产铝硅合金所消耗的一、二次能涯、各种原材料换算成一次能源标煤的形式,计算和分析铝硅合金生产的综合能耗,提出电热铝硅合金是一种节能产品,电热法生产铝硅合金是发展铝工业的有效途径。     

高精深冲用铝合金薄板的开发

论述了各种工艺因素,诸如化学成分,均热制度,热轧及热精轧温度,冷轧变形量,中间退火温度等对罐板用铝合金板的性能,特别是深冲性能的影响。通过试验与分析得出应采取的最佳工艺方案与工艺路线。同时提出了为完善罐板国产化需配套建立先进的辅助生产线的建议。     

6005A-T6铝合金板材生产工艺研究

研究了6005A铝合金板材淬火温度、人工时效温度和时间与板材组织、性能的关系,确定了6005A-T6板材的热处理制度:淬火温度520℃,人工时效温度及时间为(165±5)℃8 h。     

485-O铝合金双金属复合板材的研制

研究退火温度对485铝合金双金属复合板组织和性能的影响,制定出合理的工艺制度,生产出满足市场要求的产品。     

Processing and properties of ultrafine-grain aluminium alloy 6111 sheet

The equal channel angular processing (ECAP) technique has been applied to an automotive aluminium alloy sheet (A6111). The technique utilizes a machine that was specially designed for this purpose at Monash University. It was determined that ECAP is able to refine the grain size of the sheet, diminish the detrimental as-rolled texture components in the sheet and retain an acceptable level of bi-axial ductility such as is required during the automotive forming process. Experiments were carried out on annealed, as-received sheets that were subjected to either one or two passes through the ECAP machine. For the second ECAP pass, the sheet could be processed in the same orientation as the first pass (route A) or it could be rotated 180° about the direction of feeding (route C). It was determined that route A produced marginally improved properties compared to sheet processed via route C, and that due to the frictional heating generated during the second pass, a significant amount of recovery occurred in the sheet such that an improved combination of texture and formability resulted after two passes compared to the same sheet exposed to only a single pass.     

Ultrasonic welding of heat-treatable aluminium alloy A6061 sheet

In this study, the authors applied the ultrasonic welding method to weld A6061 heat treatable aluminium alloy and investigated the effects of clamping load and welding time on the properties of the weld. In addition, in order to improve the strength of the joint, the effectiveness of the ethanol droplet on the faying surface was examined. The following results were obtained.

The joint strength increased with clamping load and welding time. The fracture of the joint produced under the welding conditions of 1176 N clamping load and 1.5 s welding time occurred in the base metal. The ethanol droplet on the faying surface successfully produced the joint with a strength equivalent to that of the base metal under the welding conditions of smaller clamping load and shorter welding time than the case without ethanol droplet. The softening around the welded area that was performed with the ethanol droplet was smaller than that in the welded area produced by other methods such as TIG and friction stir welding. The fracture surface of the joint welded with the ethanol droplet was remarkably irregular and rough. A dimple pattern was observed over a wide area, indicating that the welded area was significantly expanded. The ethanol droplet made the temperature of the weld area higher than that without ethanol, resulting in improved joint strength with an increase of the plastic deformation at the interface.     

5A01-O铝合金板材退火工艺研究

试验研究了退火温度、保温时间对5A01-O合金板材组织与性能的影响,确定了合理的退火工艺制度。结果表明,按照确定的工艺制度生产的板材的力学性能指标达到GJB1742-93标准要求的。     

铝合金板成形中摩擦与润滑的研究进展

概述了铝合金板成形过程中的摩擦机理、摩擦模型和润滑的发展现状.全面分析了铝合金板成形的影响因素,阐述了润滑剂的作用机理,展望了其发展趋势,提出铝合金成形应走环保型"绿色"润滑之路.     

Tantalum alloy sheet in pilot production

The fabrication of two tantalum alloys—Ta-10Hf-5W and Ta-30Cb-7.5V—into sheet bar by extrusion, forging, and rolling is investigated and evaluated. The properties of the resulting sheet—especially its tensile properties and bend and weld ductility—are reported. Indications that sound fusion welds in the Ta-Cb-V alloy cause no appreciable loss in strength or ductility are given.     

模具温度对铝合金板拉深性能的影响

借助商用有限元仿真软件ABAQUS,采用热力耦合有限元法对汽车用铝合金板5083-O的圆筒件温拉深过程进行数值模拟.在此基础上,利用试验设计方法,分析初始温度布置对拉深能力的影响,并给出拉深件破裂失效形式.研究结果表明,凸模底部和凹模法兰的温度决定着铝合金板拉深能力,在凹模法兰处于较高温度250℃而凸模底部处于室温的拉深模式中,临界凸模行程最大;而拉深件的破裂失效即可能出现在凸模圆角区附近,也可能出现在凹模圆角区附近.可见,差温拉深中温度布置对发挥板料成形能力十分重要.     

变压边力条件下铝合金板的成形窗口

在由塑性成形理论和能量法分别建立的临界破裂和临界起皱压边力模型基础上,构建了变压边力情况下汽车用铝合金板的成形窗口,并分析了拉深比、材料参数和模具参数对成形窗口的影响规律.对比实验表明:在整个有效压边力范围内,数学模型构建的成形窗口能够与实验相吻合,且铝合金6111-T4和5052-O的成形窗口明显小于钢板st14的.而影响因素分析显示:随着拉深比降低、厚向异性系数(r)增加和凹模圆角半径(Rdp)增大,成形窗口明显扩大;n值增加,成形窗口虽然有所扩大,但是效果并不明显.