基于第二相热力学计算的7050铝合金成分优化及设计

利用JMatPro热力学计算软件和相应的铝基合金数据库,在固溶温度475℃ 下,计算了S(Al2CuMg)、Al7Cu2Fe、Mg2Si和Al3MD023等第二相在7050铝合金中的相含量,研究了Zn、Mg、Cu、Fe、Si和Zr等合金元素对第二相相含量的影响规律,并建立了第二相含量与合金元素含量之间的关系回归方程.研...     

Zr含量对Er变质Al7Si0.3Mg合金组织及力学性能的影响[1]

本文在Al7Si0.3Mg合金含0.3%Er的基础上研究了不同Zr含量对合金组织及力学性能的影响。研究结果表明,在添加Zr元素之后,Zr与Er形成了第二相颗粒Al3Er和Al3Zr,这些第二相粒子在铝液凝固过程中起到双重形核和细化作用,显著细化α-Al和共晶Si的分枝,提高了合金的力学性能。当Zr含量为0.2%时,其抗拉强度达到了182MPa,延伸率为6.4%,较未添加Zr元素的合金抗拉强度和延伸率分别提高了16.7%和33.3%。     

Cu,Li含量对新型超高强铝锂合金力学性能及微观组织的影响

利用力学性能测试和TEM分析测试手段,计算出铝锂合金Al-(3.6%~4.15%)Cu-(1.1%~1.4%)Li中非固溶Cu,Li原子摩尔分数总和及Cu/Li原子摩尔分数比,分析了强度和微观组织之间的影响机理.结果表明,合金中的主要时效强化相为大量T1相(Al2CuLi)和少量θ′相(Al2Cu),Li含量较高的合金可能析出的极少量δ′相(Al3Li).在上述成分范围内,随Cu含量或Li含量增加,合金强度提高,且Li含量的增加幅度不同,对合金强度的提高幅度存在明显的差异.非固溶Cu,Li原子摩尔分数总和及其比例共同作用,通过影响析出相总量、类型及各析出相分数决定合金强度.要获得铝锂合金的超高强度,在提高Cu,Li原子摩尔分数总和的同时,还要提高其比例.     

铜在纯铝基体中的扩散行为

制备Al-Cu共晶合金钎料，用SEM和EDS研究不同钎焊温度和保温时间条件下。纯铝棒料基体对接真空钎焊接头Cu元素的扩散行为。结果表明．钎焊温度过低、保温时间过短时。Cu元素在基体内部尚来能充分扩散，在基体晶界上严重偏析，生成Al-Cu相中最脆的θ相（Al2Cu）。提高钎焊温度和保温时间有利于提高Cu元素在Al基体中的扩散效果。但过高的钎焊温度又导致θ相的重新出现，选取最佳的钎焊工艺参数才能获得良好的钎缝质量。     

熔炼温度对含钼废渣冶炼的MoFe中杂质元素含量的影响

本文采用低温冶炼工艺,利用氨浸渣和钼酸钙两种含钼工业废渣进行了直接还原冶炼钼铁。在实验过程中,研究了熔炼温度对MoFe合金中C、P、S、Si、Cu等杂质元素含量的影响。实验结果表明：熔炼温度为1 500 ℃时,C含量最低为0.72%,其他杂质元素也符合相应的要求,故最佳熔炼温度为1 500 ℃。     

挤压态Mg-9Li-xAl-0.6Y合金组织与力学性能研究

对Mg-9Li-xAl-0.6Y(x=0、3%、6%、9%)合金进行挤压实验。采用光学显微镜(OM)、拉伸实验机和扫描电子显微镜(SEM)表征分析Al元素含量的变化对合金的显微组织、力学性能和断口形貌的影响。结果表明:随着Al含量的增加,合金中的α-Mg相数量增多的趋势为先上升后下降,β-Li相数量的变化与之相反;合金的抗拉强度逐渐提高,当Al元素含量增大至9%时,抗拉强度达到最大,为261MPa。与未添加Al的合金相比,抗拉强度提高了43.4%。当Al含量从0增加到9%时,合金延伸率先下降后上升再下降。     

挤压态Mg-9Li-xAl-0.6Y合金组织及力学性能研究

本研究在Al元素含量分别为0、3%、6%和9%条件下对Mg-9Li-xAl-0.6Y合金进行挤压试验。借助光学显微镜、拉伸试验机和扫描电镜来分析Al元素含量的变化对合金的显微组织、力学性能和断口形貌的影响。结果表明：在Al含量增加的条件下,合金中的α-Mg相数量增多的趋势是先上升后下降,β-Li相数量的变化却与之相反;合金的抗拉强度逐渐提高,当Al元素含量增大至9%时,抗拉强度达到最大值261 MPa。与未添加Al的合金相比,抗拉强度提高了43.4%。当Al含量从0增加到9%时,合金延伸率先下降后上升再下降。     

Zn-Cu包晶合金凝固组织和物相演化规律

采用光学显微镜(OM)和扫描电子显微镜(SEM)等手段研究不同铜含量Zn-Cu合金的铸态凝固组织形貌以及冷却速度对包晶显微组织的影响。结果表明,Zn-2%Cu合金中存在六角花瓣状η相和板条类层片状η相两种结构,类层片状η相的平均层片间距为8.64μm,随着冷却速度的提高,板条类层片状η相的数量增加幅度较大。Zn-3%Cu、Zn-4%Cu过包晶合金的凝固组织都是由初生ε相、包晶η相和基底η相共同构成,随着冷却速度的提高,初生ε相的枝晶壁更发达,包晶η相的厚度更薄。     

AA6060/AZ31复合棒材含Zn界面层显微结构与力学性能研究

采用正向等温挤压将AA6060铝合金和AZ31镁合金制成包覆棒材，并利用XRD、OM、SEM、EDS、显微硬度仪等对加Zn层铝镁复合棒材的显微组织与力学性能进行重点研究。结果表明，在360℃的挤压温度下，Al/Zn/Mg界面结合良好，未见明显缺陷；Zn的加入有效减少或避免Al-Mg金属间化合物的形成，在界面处发生元素扩散，冶金反应生成Mg-Zn共晶相MgZn、MgZn2、Mg2Zn3；对比Al/Mg复合，Zn促进了AZ31晶粒细化，小于5μm晶粒增加3.91%；界面处Mg-Zn共晶相明显提高显微硬度值，可达163.1HV，比Al/Mg界面高30HV左右，且Al/Zn/Mg/界面剪切强度提升30.74%。     

CaO-MgO-FeO-Al2O3-SiO2-P2O5熔融还原渣熔化温度的研究

采用IST-1600PC熔点熔速测试仪,对CaO-MgO-FeO-Al2O3-SiO2-P2O5熔渣的熔化温度进行了测试。根据熔融还原冶炼惠民高磷铁矿的试验特点和工艺条件,选择的熔渣成分组合为:二元碱度0.8¹.4,Al2O3含量6.4%1.4,Al2O3含量6.4%¹2.4%,P2O5含量0%12.4%,P2O5含量0%³%、分别固定MgO、FeO含量为4%、12%。研究表明,当P2O5或Al2O3含量一定时,碱度对熔化温度的影响趋于一致,熔渣的熔化温度随着熔渣碱度的增大先降低后升高,在碱度R为1.0时最低,而且最低点的温度与P2O5或Al2O3含量成正比,P2O5或Al2O3含量越高,最低点处的温度越高;当碱度或P2O5含量一定时,熔化温度会在Al2O3含量为9.4%时出现拐点;当碱度或Al2O3含量一定时,熔化温度均随着P2O5含量的增加而提高。     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared