7055合金挤压带板纵横向的组织与性能

采用力学性能测试和金相实验,研究了7055合金挤压带板纵横向力学性能随固溶处理时间的变化,以及纵向取样位置对带板力学性能的影响.结果表明,7055合金挤压带板在470℃保温超过20min,其固溶处理基本充分,继续延长固溶处理保温时间,不能提高合金的强度,但合金延伸率略有升高.挤压带板的纵向强度明显高于横向的强度,但其延伸率明显低于横向的延伸率.挤压带板在宽度方向距中心不同距离样品的纵向强度差别较大,从心部至边部强度明显提高,而延伸率变化不大,在研究挤压带板的纵向性能时应考虑由此而带来的影响.     

固溶处理对镍-铬-钼合金力学性能的影响及断口分析

对热压成型的镍-铬-钼合金固溶前、后的金相组织及断口进行了分析。结果表明:经1250℃×4h固溶处理后合金的拉伸强度和塑性都优于1200℃×4h固溶处理后合金的拉伸强度和塑性,且两者的拉伸强度和塑性均优于固溶处理前合金的拉伸强度和塑性。经固溶处理后合金的拉伸强度和塑性增强的原因是固溶处理可使合金中的Cr,Mo和W等元素在Ni中的固溶程度加强,因此,固溶强化作用也随之加强,并且固溶处理还可以消除有害的金属间相。     

复合添加Zr,Cr,Pr对Al-Zn-Mg-Cu-Zr合金再结晶行为的影响

采用铸锭冶金法制备Al-Zn-Mg-Cu-Zr合金和Al-Zn-Mg-Cu-Zr-Cr-Pr合金,再对其进行均匀化退火(460℃/24 h)、锻压、固溶处理—室温水淬及峰时效处理。用金相显微镜观察合金的显微组织,并测试其力学性能,研究复合添加Zr、Cr、Pr对Al-Zn-Mg-Cu超高强铝合金再结晶行为和力学性能的影响。结果表明,复合添加Zr、Cr和Pr可显著抑制Al-Zn-Mg-Cu合金在锻压后回复过程中的亚晶合并长大,使该合金在较高温度(490℃)以及高温长时保温(480℃固溶4 h)情况下仍能保持细小的亚晶组织,从而提高合金的力学性能。复合添加Zr、Cr、Pr能使合金在490℃固溶1 h后在T6状态下的抗拉强度提高约25 MPa、屈服强度提高近30 MPa。     

Sc含量对Al-2%Cu合金固溶处理行为的影响

借助力学性能测试及光学金相（OM）和透射电镜（TEM）的观察和分析，研究了Sc含量的变化对Al-2％Cu合金固溶处理行为和力学性能的影响。结果表明：随着Sc含量增加，合金的熔点降低；520℃／20min同溶态时，合金的拉伸强度提高（δmax达到40MPa），晶粒组织在固溶完全时仍较细小，这要归功于Sc的加入形成了细小Al3Sc粒子起到很好的作用。     

回溶处理对7050高强铝合金显微组织和机械性能的影响

为了获得7050高强铝合金较为理想的固溶处理制度,通过组织观察(光学显微镜和扫描电镜)、洛氏硬度测试、拉伸力学性能测试、能谱分析等方法研究了固溶处理对7050高强铝合金显微组织和性能的影响.结果表明,在430～470℃范围内,随固溶温度的增加或固溶时间的延长,合金的粗大相逐渐回溶入基体组织中,固溶效果增强,经过淬火后组织过饱和度增大,经人工时效后的基体强化效果增强,强度逐渐提高.然而,随着固溶温度进一步提高或延长固溶时间,造成了晶粒的长大,过剩相减少,析出相的弥散强化作用减弱,基体强度逐渐降低.所得7050高强铝合金较为理想的固溶处理制度为470℃×60 min.     

固溶处理对Inconel 690合金组织和力学性能的影响

 研究了不同固溶处理制度对Inconel 690合金组织和力学性能的影响。结果表明：Inconel 690合金在1 050 ℃以上固溶处理时,组织充分固溶;在950~1 150 ℃温度范围内固溶处理时,晶粒正常长大,晶粒长大激活能Q=309 kJ/mol;当固溶温度为1 050 ℃,在不同固溶时间下,晶粒尺寸与室温力学性能符合Hall Petch关系式,合金强化机制主要为细晶强化。     

固溶处理对新型马氏体时效不锈钢力学性能的影响

研究了固溶处理对新型Cr-Ni-Co-Mo马氏体时效不锈钢力学性能的影响.结果表明,在低于1050 ℃固溶处理时钢中存在一些以χ相为主的金属间相,它们不仅严重破坏了钢的韧性,而且使钢在时效处理后的最终强度降低了100 MPa;经1050 ℃固溶处理后钢的基体组织为高密度位错的板条马氏体,此固溶态组织经适当时效处理可以使钢的强度达到1940 MPa,且得到与其高韧性匹配良好的综合力学性能.     

7075航空铝合金TIG焊后热处理对其接头力学性能的影响

以航空用7075铝合金为焊接母材,采用航空专用铝合金ER5056焊丝对其进行TIG焊接,将焊后接头进行固溶处理+时效处理,研究焊接电流为130 A条件下的接头在不同固溶温度与固溶时间、不同时效温度与时效时间下进行热处理,通过对接头的硬度、拉伸力学性能、断口形貌及能谱进行表征发现,当固溶温度与时间为470℃×2 h、时效温度与时间为120℃×24 h条件下得到的接头具有较好的综合力学性能。     

7050铝合金模锻件的热处理过程研究

将7050铝合金模锻件产品取样进行475℃×1 h固溶处理后,按照105℃×8 h、120℃×8 h、150℃×4 h、177℃×7 h依次叠加时效处理并于中间过程取样,采用透射电镜（TEM）、布氏硬度测试（HB）及能谱分析（EDS）等方法研究7050铝合金模锻件的固溶及四级时效热处理工艺过程中组织、化合物相和力学性能的演变规律。结果表明：固溶态合金中有含Fe、Ni、Ti、Si等杂质元素的未溶化合物以及少量的S相（Al2CuMg）;合金依次经4次时效处理后硬度逐渐升高;时效处理过程中,S相同时沿晶界和晶内析出,η相（MgZn2）呈颗粒状分布于Al基体上,尺寸约为40～50 nm。其中177℃时效处理后观察到的纳米级析出物η或η’相是7050合金的主要强化相。     

固溶处理工艺对改良铸造铝硅合金组织和性能的影响

通过不同温度和时间的固溶制度研究了固溶处理工艺对改良铸造铝硅合金(0.35%Mg,7.0%Si,0.2%Ni,2.0%Cu,0.8%RE,0.2%Mn,0.1%V,其余为铝)组织和性能的影响。实验结果表明,在495℃×5h进行固溶处理时,改良铸造铝硅合金具有最好的综合力学性能:Rm=239MPa,硬度=103HBS,A=6.24%;改良铸造铝硅合金于495℃×5h固溶淬火析出富含Si、Cu、Ni以及RE元素的Si、Al Cu、Al6Cu3Ni、Alx Cu Ce相。这些相的存在,有利于提高合金的力学性能和高温性能。合金经过热处理后以韧性断裂为主要方式并伴有准解理面现象,拉伸断口微观形貌主要表现为韧窝断口特征,有些存在少量撕裂棱。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.