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热挤压对喷射沉积7055铝合金显微组织和力学性能的影响 总被引:1,自引:0,他引:1
《粉末冶金材料科学与工程》2015,(5)
采用全自动控制往复喷射成形工艺制备工业规格7055铝合金锭坯,研究热挤压工艺对喷射成形7055铝合金的显微组织和力学性能的影响。采用电子背散射衍射技术对经不同热挤压后7055铝合金的织构进行研究。结果表明,喷射沉积锭坯组织为等轴状晶粒,均匀细小(30~50μm),基体中不存在枝晶型偏析。由于喷射沉积工艺本身的特点,在合金中存在大量的显微疏松缺陷。沉积锭坯经过热挤压致密化后,合金力学性能显著提高,抗拉强度σb为390 MPa,伸长率δ为13.3%,表明热挤压工艺可有效消除疏松缺陷,从而充分发挥出喷射沉积工艺的优越性。EBSD分析表明,挤压后沿着挤压轴方向形成丝织构,主要为?001?与?111?两种织构。 相似文献
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采用喷射成形方法制备2124铝合金坯,探索其热轧致密化工艺,并研究热轧变形量和变形温度对材料显微组织和力学性能的影响。结果表明,材料最佳的热轧温度为450℃,在该温度下热轧可以保持喷射成形工艺制备的2124铝合金获得细小晶粒组织的优势,且轧件可以获得较佳的力学性能。热轧过程中,当总变形量小于30%时,材料的致密化速度较快;当总变形量达到40%时,材料基本完成致密化。当热轧温度为450℃,变形量为80%时,喷射成形+轧制后材料的拉伸性能高于铸造+轧制的材料。对喷射成形+热轧材料进行T6处理,材料强度可较大提高,抗拉强度达到502.2MPa,伸长率为12.23%。 相似文献
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Al10Zn2.9Mg1.7Cu超高强铝合金的喷射成形制备研究 总被引:12,自引:4,他引:8
采用喷射成形技术制备了Al10Zn2.9Mg1.7Cu高强高韧铝合金沉积坯件,研究了喷射成形制备过程中各工艺参数对沉积坯件的成形性、显微组织、致密度的影响,确定了适当的工艺参数,研究了沉积坯件的热挤压及热处理工艺,对材料的组织进行了分析并对不同状态的材料性能进行了比较。研究结果表明:当喷射成形工艺参数合理时,沉积坯件具有良好的成形性与致密度,在随后的热挤压过程中,通过较低的挤压比即可使材料达到全致密;通过对合金进行适当的热处理,材料的极限抗拉强度达到810MPa,同时延伸率保持在8%-11%,该材料是一种理想的轻质高强结构材料。 相似文献
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采用喷射成形技术制备了Al1 0 Zn2 .9Mg1 .7Cu高强高韧铝合金沉积坯件 ,研究了喷射成形制备过程中各工艺参数对沉积坯件的成形性、显微组织、致密度的影响 ,确定了适当的工艺参数 ,研究了沉积坯件的热挤压及热处理工艺 ,对材料的组织进行了分析并对不同状态的材料性能进行了比较。研究结果表明 :当喷射成形工艺参数合理时 ,沉积坯件具有良好的成形性与致密度 ,在随后的热挤压过程中 ,通过较低的挤压比即可使材料达到全致密 ;通过对合金进行适当的热处理 ,材料的极限抗拉强度达到 810MPa ,同时延伸率保持在 8%~ 11% ,该材料是一种理想的轻质高强结构材料。 相似文献
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<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 相似文献
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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, 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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, 相似文献
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《China Nonferrous Metals Monthly》2014,(12)
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. 相似文献
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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. 相似文献
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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. 相似文献