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W型铁氧体Ba(MnCu)xCo2-2xFe16O27的微波吸收性能周克省1,卢玉娥1,尹荔松1,秦宪明2,邓联文1,翟志彩1,陈颖1,夏辉11. 中南大学物理科学与技术学院2. 厦门市宏业工程建设技术有限公司摘 要:采用溶胶-凝胶法制备了(MnCu)组合掺杂W型钡钴铁氧体Ba(MnCu)xCo2-2xFe16O27(x=0.1,0.2,0.3,0.4,0.5)样品.用XRD和SEM对样品的晶体结构,表面形貌,粒径进行了表征,用微波矢量网络分析仪测试了该样品在218GHz微波频率范围的电磁参数,根据测量数据计算电磁损耗角正切及得出微波反射率与频率的关系,探讨了该材料的微波吸收性能与电磁损耗机理.研究结果表明,Ba(MnCu)xCo2-2xFe16O27晶粉呈微米级六角片状形貌,煅烧温度1235℃以上的......
高阻尼MnCu基合金的制备工艺研究邢长军,孙国强,姚春发,宁小智,吴林钢铁研究总院摘 要:MnCu合金做为阻尼合金用于制备减振装置,由于基体组织为Mn基,在熔炼及后续加工制备过程中常造成产品废品率较高,本文通过对该合金材料熔炼工艺的探索,结果表明采用氧化铝坩埚和二次熔炼工艺制备出来的MnCu合金具有较高的纯净度和较好的力学性能,满足作为结构件材料使用.关键词:阻尼合金;MnCu合金二次熔炼;......
.MnCu合金通过合适的热处理,可以获得出色的阻尼性能,并兼具优良的力学性能,因此受到人们的青睐.本文采用真空熔炼,开坯锻造等通用工艺制备Mn20Cu5Ni2FeCe合金.运用多功能振动样品磁强计,激光热膨胀仪及动态热机械分析仪等手段,研究了固溶及时效状态合金的相转变及阻尼性能.研究结果表明:合金的物理膨胀系数在235K左右低温区出现极小值,同时磁化强度在该温区发生转变.分析得知该转变为合金中贫Mn区的顺磁反铁磁性转变.该贫Mn区低温磁性转变引起晶格畸变,在应力的作用下,出现低温孪晶亚结构,导致在该温区出现低温阻尼峰.根据上述研究结果,提出的MnCu合金阻尼机制的微观模型能够解释阻尼温度谱的特征.关键词:MnCu合金;膨胀系数;磁性能;模型;......
枝晶偏析对MnCu合金阻尼性能的影响谢晋武1,刘文博1,李宁1,颜家振1,钟珍玉1,刘颖2,赵修臣21. 四川大学制造科学与工程学院2. 北京理工大学材料科学与工程学院摘 要:通过砂型铸造法控制Mn Cu合金的凝固过程,获得具有显著成分偏析的枝晶组织,能够进一步促进时效过程中调幅分解的发生,是提高其阻尼性能的又一有效途径.采用JN-1倒扭摆,OLYMPUS显微镜,SEM,DMA,XRD等手段,系统研究了枝晶偏析对M2052合金阻尼性能的影响.结果表明,铸造M2052合金在铸态下,已含有少量孪晶马氏体,具有一定的阻尼性能;且经过435℃×4 h时效处理后,该合金的阻尼性能明显提高(δ=0.26),甚至超过锻造M2052合金(δ=0.20).这主要是由于铸造成分偏析的富Mn区可促进纳米级高富Mn区的形成......
The Strengthening of Cu-15Ni-8Sn Alloy WANG Ming-Pu1,WANG Yan-hui1,HONG Bin1 (1.School of Material Science and Engineering, Central South University, Changsha China) 摘要:The microstructure, property and relation between them of Cu-15Ni-8Sn alloy are studied by means of TEM and the measurement of hardness. The results show that γ '' metastable phase strengthens alloy because of its ordering......
The Technological Improvements of Aluminum Alloy Coloring by Electrolysis LI Nai-jun1 (1.Teachers College, Shenyang University, Shenyang 110015, P. R. China) 摘要:The technological process of coloring golden-tawny on aluminum alloy by electrolysis was improved in this paper. The optimum composition of electrolyte was found, the conditions of deposition and anodic oxidation by electrolysis were......
Microstructure and Performances of Nanocrystalline Zinc-nickel Alloy Coatings LI Guang-yu1,NIU Li-yuan1,JIANG Zhong-hao1,LIAN Jian-she1 (1.The Key Lab of Automobile Materials, Ministry of Education, China, College of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun, 130025, China) 摘要:Nanocrystalline zinc-nickel alloy coatings were deposited from an alkaline......
Alloy 20不锈钢薄板等离子弧焊接工艺研究赵斌,王宾宾,王小华中国船舶重工集团公司第七二五研究所摘 要:对Alloy 20不锈钢薄板进行了等离子弧焊接工艺试验研究.结果表明,采用等离子弧焊接方法,ERCr Ni Mo-3焊材及合理的焊接工艺参数,等离子弧焊接工艺可用于Alloy 20不锈钢薄板的焊接,焊接接头各项性能均能满足要求.关键词:Alloy 20;不锈钢薄板;等离子弧焊接;......
)Abstract:Stainless die with micro-groove and micro-hole have been designed and manufactured, which has been used to study superplastic microforming of 2091Al-Li alloy by means of superplastic forming... micro-rib specimen, behavior of material could be understood well.Key words:superplasticity; microforming; extrusion; 2091Al-Li alloy......
Trans. Nonferrous Met. Soc. China 22(2012) s656-s660 Microforming of superplastic 5083 aluminum alloy Md. Abu Mowazzem HOSSAIN1, Sung-Tae HONG1, Kyu-Yeol PARK1, Young-Sang NA2 1. School of Mechanical...: The mechanical behavior of superplastic 5083 aluminum alloy during microforming process was investigated by finite element analysis. A micro V-groove die was modeled to analyze the effects of forming......
