TiC对新型Al-P中间合金变质效果的促进作用

本文研究了自制新型Al-P中间合金对共晶及过共晶Al-Si的变质作用。发现该Al-P中间合金对共晶及过共晶Al-Si合金都具有优良的变质效果。同时还发现，当铝合金熔体中存在TiC颗粒时，Al-P中间合金对两类Al-Si合金的变质效果会增强。当Al-24Si合金中TiC含量为0.03%时，初晶Si的平均尺寸由原来的47μm降为41μm，最大尺寸由原来的75μm降为55μm；加入Al-P中间合金和TiC颗粒后50分钟，就可以出现变质效果，时间再延长，变质效果也不会有更大的提高，当Al-12Si合金中TiC含量为0.03%时，初晶Si的平均尺寸幅度原来的50μm降为30μm,Al-P中间合金变质剂在铝合金活塞中有较好的应用。     

Al—P中间合金变质剂在Al—Si活塞合金中的应用

在生产条件下比较了用Al-P中间合金与磷盐变质剂处理共晶和过共晶Al-Si合金的工艺特点、变质效果、力学性能和综合成本等，结果表明：使用Al-P中间合金操作方便，变质效果好、且稳定、力学性能也有不同程度的提高，而且该中间合金无渣、无污染，其使用可以实现生产过程的“零时间”变质处理，节约能源，提高生产效率，提高合金的实收率，降低产品的综合成本，有着良好的应用前景。     

Al—P中间合金对Al—Si合金的“绿色”变质

用 Al- 3P中间合金对 ZL1 0 9合金进行了变质生产试验 ,研究了其在生产中的工艺参数及加入工艺。对共晶成分的 Al- Si合金 ,其加入量按 W原料 × ( 0 .4%～ 0 .45 % ) + W回炉料 × 0 .1 %=WAl-3 P中间合金 进行计算称量 ,在 760～ 770℃变质即可取得良好的变质效果 ,生产出品质优良的活塞铸件。使用 Al- P中间合金变质剂加入方便 ,无渣无污染 ,可以提高合金的实收率、降低生产综合成本 ,适于工业化生产应用 ,是磷盐变质剂良好的替代品。     

铝硅合金磷变质工艺的研究

本文在研究开发红梅-1号多功能磷复合变质剂、红梅-2号磷酸盐块状变质剂和红梅-3号特种合金磷变质剂的基础上，紧密联系活塞生产的实际，对Al-Si合金采用磷变质的各项工艺参数进行了研究探讨，重点对应用红梅-3号的工艺参数进行了研究探讨；同时，对磷变质相关的几个理论性的问题作了阐述，并对ZLl08和ZLl09合金成分的工艺配比提出了我们的建设性意见，希望对从事活塞生产已经和准备采用磷变质的厂家有一定指导意义。     

氢含量对Al-P中间合金变质效果的影响

利用测氢仪等测试手段研究了 ZL1 0 9熔体中氢含量对 Al- P中间合金变质效果的影响。结果表明 ,在相同的铸造条件下 ,变质后合金中熔体氢含量越高 ,初晶 Si晶粒的平均晶粒尺寸和最大晶粒尺寸越大。保温时间过长合金熔体有吸氢倾向 ,初晶 Si尺寸有增大趋势。在精炼处理充分的条件下 ,Al- P中间合金的变质效果可保持 3 0小时不失效     

涡流法判断铝硅合金活塞变质效果的方法

铝硅合金变质前后组织中共晶硅的形态发生明显变化,导致材料电导率改变,应用涡流传感器采集不同变质效果的试块或活塞的电信号,信信号的大小可判断铸件的变质效果。     

铝——硅共晶活塞合金的Na,P变质

本论文致力于KS1275活塞合金分别经Na,P变质后，在机械，物理性能以及铸造性能等方面的比较，同时基于铸造理论和实践结果，对影响P变质效果的一些重要因素进行分析，小结。     

红梅-3号特种合金磷变质剂的研制与应用

为满足铝活塞产品质量的需要，继“红梅—1号多功能磷复合变质剂”和“红梅—2号磷酸盐块状变质剂”后，我们又新研制开发了多相长故、环保型“红梅—3号特种合金磷变质剂”。这是一种高技术合量的新型以—Si合金磷变质剂，无论在产品质量上、使用性能上还是变质效果可与国外生产的P——Cu棒变质剂媲美。     

一种从Al-Si活塞合金中除Ca的新方法

研究了一种从Al-Si活塞合金中除Ca的新方法.结果表明：向经P变质处理的合金熔体中加入Al-C中间合金能使Ca含量显著降低,并使P的变质效果得到恢复.     

CX型锶盐长效复合变质剂在ZL104合金中的试验

作者研制的锶盐长效复合变质剂用于ZL104合金,对共晶硅的变质效果良好,提高了合金的力学性能。变质处理时,没有潜伏期,有效时间达7小时以上,对生产环境无污染。     

The superior hydrogen-generation performance of multi-component Al alloys by the hydrolysis reaction

To obtain Al alloys possessing the excellent hydrogen-generation performance with high efficiency/low cost via the hydrolysis reaction of aluminum with water, a series of as-cast Al alloys (∼10 g) alloying by 13 kinds of Ga-based low melting point alloys with different contents were prepared by the high frequency induction melting method under a high purity argon atmosphere. The effect of the content and composition of the low melting point alloys on the hydrogen-production property of Al alloys ingots with the tap water was systematically investigated. The relationship among the hydrogen production performance, the microstructure, and the phase constituents of these Al alloys was investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy disperse spectroscopy and differential scanning calorimeter (DSC). Compared with conventional activated Al alloys powders prepared by the ball-milling method, the as-cast bulk Al alloys show the same excellent properties of hydrogen production, i.e., the high hydrogen-generation ratio but slower and more persistent hydrogen generation rate. The preparation method of Al-alloy ingots is simple, convenient, low preparation cost and high efficient, compared with the ball-milling method, which shows the significant industrial application value and prospect. Besides, the activation mechanism of the Al-water reaction dynamics was revealed on the basis of the analysis of the microstructure, phase composition and related literature.     

Formation Ti6Al4V alloy by hydride cycle mode and its (Ti6Al4V)H1.606 hydride in self-propagating high-temperature synthesis mode

The wide use of titanium alloys is limited by high costs of both their producing technology and processing. The expansion of area of their application depends on development of more efficient, resource-saving, economical methods providing reduction in the cost of titanium alloys and titanium made products. The hydride cycle (HC) method for synthesis of binary and multicomponent refractory alloys and hydrides can be suitable alternative to traditional metallurgy for production of the alloy in small quantities (small-sized products for technical/medical purposes). This work presents the results of study on the mechanism of Ti–6Al–4V alloy formation in HC. The synthesis parameters are evaluated and optimized. The physicochemical, structural and hydrogen-sorption characteristics of the alloy samples are described. Actually, a resource-saving, efficient technology for synthesis of Ti–6Al–4V alloy by HC is developed and proposed. The synthesized alloy interaction with hydrogen in Self-Propagating High-Temperature Synthesis mode was investigated.     

Electrochemical performance of melt-spinning Al–Mg–Sn based anode alloys

Rapidly solidified Al–0.5Mg–0.1Sn–0.02In (0.02Ga)–0.1Si (wt. %) alloys were prepared as anode alloys for Al–air battery by the single roller melt-spinning method. The corrosion behavior of the alloys and the Al–air battery performance were investigated in both 2 M NaCl and 4 M NaOH solutions. Results obtained have shown that the Al–0.5Mg–0.1Sn–0.02Ga–0.1Si alloy has a better electrochemical performance in the 2 M NaCl solution, while Al–0.5Mg–0.1Sn–0.02In–0.1Si alloy shows a better electrochemical performance in the 4 M NaOH solution. In the 2 M NaCl solution, both alloys suffer from a uniform corrosion. In the 4 M NaOH solution, the corrosion morphology of the alloys evolves from an intergranular corrosion to a uniform corrosion. SEM and EIS results are in good agreement with electrochemical characteristics.     

Investigation on hydrogen production using multicomponent aluminum alloys at mild conditions and its mechanism

A series of Al alloys with low melting point metals Ga, In, Sn as alloy elements were fabricated using mechanical alloying method. The phase compositions and morphologies of different Al alloys were characterized by XRD and SEM techniques. The reaction of the Al alloys with water for hydrogen evolving at mild conditions (at room temperature in neutral water) was studied. The results showed that there were no hydrogen yields for binary Al–Ga, Al–In, Al–Sn and the ternary Al–Ga–Sn alloys. The hydrogen yields were observed for Al–Ga–In and Al–In–Sn ternary alloys. The Al–In–Sn alloys showed an even faster hydrogen generation rate and higher yields than Al–Ga–In alloys. Based on the ternary Al–Ga–In and Al–In–Sn system, the hydrogen production property of quaternary Al–Ga–In–Sn was greatly improved. The hydrogen conversion efficiency of the optimized Al–3%Ga–3%In–5%Sn alloy was nearly 100% in tap water. The highest hydrogen generation rate reached 1560 mL/g min in distilled water or deionized water. It was suggested that both the embrittlement of Al by liquid Ga–In–Sn eutectic and the active points formed by intermetallic compounds In₃Sn and InSn₄ may be attributed to the high activity of Al–Ga–In–Sn alloys at room temperature.     

Effect of hydrogen treatment on solidification structures and mechanical properties of TiAl alloys

The effect of hydrogen treatment (HT) on the solidification structures and mechanical properties of Ti-47Al alloys were studied using different contents of hydrogen. Experimental results indicate that together with the refinement of lamellar structure, the grain size of Ti-47Al alloys is reduced. With the hydrogen addition increasing to 1%, the grains of Ti-47Al alloys are refined from 1000 to 100 μm, and the average lamellar spacing of Ti-47Al alloys is decreased by approximately 50%. The hardness, compressive strength and yield stress of Ti-47Al alloys are improved due to the refinement effect of HT on grains and microstructures. The refinement effect of HT on cast TiAl alloys is found to be related to the enhancement of constitutional supercooling induced by hydrogen ahead of the solid-liquid interface.     

Effect of Ti on the microstructure and Al–water reactivity of Al-rich alloy

Ti-bearing Al alloys (0.1–1 wt.%) were prepared using arc melting techniques. Their microstructures were investigated using XRD and SEM/EDX, and found to depend strongly on Ti contents. Al grains are columnar as Ti contents are lower, but they are refined and turn into equiaxed ones when Ti contents are higher. The particle sizes of Ga–In–Sn phase decrease with Al grain refinement. Al–water reactivities were also investigated under different water temperatures. Kinetic measurements found that Ti prohibits Al–water reaction and reduces hydrogen yields when alloys contain little Ti. However, Al reacts with water fast and hydrogen yields rise with the increase of Ti contents of alloys. Reasons concerning the variations of microstructures and Al–water reactivities with Ti additions are discussed.     

Effects of Bi composition on microstructure and Al-water reactivity of Al-rich alloys with low-In

Bi-bearing Al-Ga-In-Sn quinary alloys were prepared by a high-temperature melting technique. The alloys primarily consist of Al(Ga) matrix and Ga, In, Sn, Bi (GISB) grain boundary phase, mainly in the form of Ga-InSn₄-InBi. The microstructure of GISB particles was obviously equiaxed with the increasing Bi dosage. Al-water reaction was tested at 40 °C. Owing to the Bi-doping, the hydrogen generation yields of alloys with InSn₄ intermetallic compound are obviously improved and hydrogen release rates gradually tend to be stable, which show great potential in applications. At the dosage of 2.53 wt% Bi, the hydrogen generation performance of alloys was more prominent in Al-water reaction, including a theoretical hydrogen generation yield and hydrogen released extremum rate to ～0.076 L/min·g Al alloy. Furthermore, the Al-water reaction mechanism of Bi-bearing Al-rich low-In quinary alloys has been put forward.     

Effect of composition on the reactivity of Al-rich alloys with water

Fe-bearing Al–Ga–In–Sn alloys were prepared by using arc melting under high purity argon atmosphere. Their microstructures were investigated by means of XRD, SEM/EDX, and the eutectic reaction of Al with grain boundary phase Ga–In–Sn (GIS) was measured using DSC. Fe dendrites were found to present on columnar Al grain surfaces. As the amount of low melting point metals (Ga, In and Sn) is 6 wt.% with a ratio of In:Sn of 15:7, these alloys just consist of Al(Ga) and In₃Sn two phases. InSn₄ was found in an alloy as its weight ratio of In:Sn approaches 1:1 with an extra addition of Sn (1 wt.%). The reactions of Al alloys with water were performed at different water temperatures ranging from 0.5 to 50 °C. Al reacted with water at a lower water temperature of 0.5 °C, but the reaction suspended within tens of minutes. Once water was heated to a higher temperature of about 15 °C, Al reacted with water again. The H₂ generation rates measured at a water temperature of 50 °C depend on the compositions of alloys. Reasons concerning the reactivity of Al–water at different temperatures are discussed.