AZ31镁合金型材挤压生产工艺的研究

采用卧式挤压机,对AZ31镁合金型材挤压工艺进行了生产跟踪试验研究,确定了AZ31镁合金型材在挤压操作时的最佳挤压筒温度、镁棒温度、模具预热温度和挤压速度。分析了型材产品的力学性能和微观组织结构,结果表明在给定操作工艺下,可得到高强度、细晶粒度、良好塑性和表面光洁的挤压型材。     

AZ31变形镁合金性能与组织的研究

对商业化的AZ31B和AZ31D变形镁合金挤压后的型材进行取样,对其拉伸性能、断口形貌和金相组织进行了观察。结果表明：挤压后的镁合金发生了动态再结晶,生成了细小的等轴晶粒,从而提高了材料的强度和塑性加工性能,其中AZ31D镁合金的塑性提高得更大。在此基础上进一步对镁合金的变形机制进行探讨。     

AZ31镁合金细管静液挤压工艺及组织性能分析

镁合金由于良好的生物相容性、可降解性和优良的力学性能,而展现出在医疗器械应用上的优越性.以AZ31镁合金为研究对象,研究镁合金细管静液挤压成形新技术,并且开发出一种高强韧AZ31镁合金薄壁细管.结果表明:模具预热温度为300℃,挤压坯料温度200℃,挤压比为17 ～31.5,采用超细石墨-PVC塑料粉制备的静液挤压用传力润滑介质进行静液挤压,获得的细管综合性能最好;挤压管坯组织与挤压前相比,得到明显改善,挤压前平均晶粒粒径为150μm,挤压后平均晶粒粒径＜7.0μm;抗压强度由均匀化处理后的210.5MPa提高至挤压后的375.2MPa.     

镁合金的立式直接冷硬铸造

1概况直接冷硬铸造(DirectChillCastihg)对于铝钢板和挤压产品的加工工艺来说,是具有成本竞争能力的先决条件,但尚没有广泛用于镁合金的铸造方面。2001年初奥地利LKR公司研究开发镁合金立式冷硬铸造工艺技术和建立中间试验厂。开发研究工作集中在采用遥控、高劳动生产率、生产高质量产品的安全问题和方便铸造生产方面,开发项目包括从熔炼、合金化、铸造、热处理到最后镁合金型材的挤压的整个工艺路线。对镁合金AZ31的挤压坯料的横截面粒度分布和宏观偏析状况进行了调研,对多腔镁合金挤压型材的机械性能和(微观)低倍组织性能进行了研究,…     

挤压态AZ31B镁合金在超塑变形过程中的微观组织及力学性能研究

通过正向温挤压获得了细晶微观组织的AZ31B镁合金。研究了在310～460℃范围内,应变速率1×10-3～1×100/s下的超塑性流变行为。结果表明,在415℃、1×10-3/s的条件下AZ31B镁合金具有良好的超塑性,最大延伸率可达380%。应变速率敏感指数达到0.47。通过光学显微镜和扫描电镜（SEM）分别观察了AZ31B镁合金在超塑变形过程中的微观组织演变和断口形貌。晶界滑移机制为AZ31B超塑变形的主要机制。     

挤压温度和挤压比对AZ31镁合金组织性能的影响

本文研究了挤压比和挤压温度对AZ31镁合金热挤压材显微组织和力学性能的影响.结果表明,挤压可以显著细化AZ31合金的显微组织,挤压比越大,晶粒尺寸越细小,力学性能得到较大提高;随着挤压温度的升高,晶粒有所长大,抗拉强度基本呈减小趋势,而延伸率则先升后降;挤压比为35、挤压温度为350℃时,可得到细化均匀的合金组织和良好的力学性能.     

AZ31镁合金的研究现状

综述了国内外对AZ31镁舍金的研究现状。讨论了主要合金元素对AZ31镁合金的组织和性能的影响,介绍了AZ31镁合金的晶粒细化、塑性成形技术的研究现状。对AZ31镁合金的发展前景进行分析。     

镁合金水平连续铸造工艺研究

详细介绍以AZ31镁合金为研究对象进行的一系列生产实践,包括水平连续铸造设备的选择、改进,镁合金液体转移装置的改造,工艺参数的选择,镁合金水平连续铸造中的缺陷与防止措施等。生产实践表明:通过改进设备、优选工艺方案,可实现AZ31镁合金锭的水平连续快速铸造。     

变形AZ31镁合金数控加工工艺参数的选择研究

镁合金作为新型的轻质高强矿产资源,目前被广泛应用于军事、医疗、卫生等领域,是现阶段最具有发展潜力的金属材料之一。传统的镁合金加工工艺受到人为能力影响,工作效率低,能源浪费大,整个加工过程时间较长。为此,提出一种变形AZ31镁合金数控加工工艺参数,通过研究变形AZ31B的加工参数,改变原有镁合金加工过程的切割焊接等行为,对镁合金的冷却和加热产生的非晶化行为进行研究,得到了变形AZ31镁合金数控加工过程中的最佳工艺参数。仿真实验表明,提出的新的数据加工工艺比传统方法在材料的抗腐蚀性、坚固程度、加工时间、加工效率等多个方面都得到了改善。     

AZ31B镁合金铸轧板的织构和冲压性能的分析

在室温条件下,AZ31B镁合金的塑性加工难度较大,而影响其加工难度的主要因素就是AZ31B镁合金的织构以及冲压性能。基于此,笔者自制AZ31B镁合金铸轧板,分别制备了普通AZ31B镁合金以及复合能场AZ31B镁合金铸轧板,对两者的织构与冲压性能进行了分析,分析的结果显示,普通AZ31B镁合金铸轧板的织构强度更大,冲压性能相对较差。     

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.