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ChunyanBAN WenqingGAO GuiyiZENG QixianBA HualinZENG 《材料科学技术学报》2003,19(3):285-286
The magnetic properties of Fe72.5 Cu1Nb2V2Si13.5B9 alloy are investigated from an amorphous to a nanocrystalline and complete crystalline state.The sample annealed at 550℃ for 0.5h shows a homogeneous nanocrystalline structure and presents excellent soft magnetic properties.When the specimens were annealed at a temperature above 600℃,the magnetic properties are obviously deteriorated because the grain size grows up,exceeding the exchange length. 相似文献
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The possibility of substituting 72.5Cu-22.7Zn-3.4Al brass for phosphorus bronze in some case that is now extensively used for elastic component, and purifying the scrap copper for recycling metal was investigated. By adding a little amount of rare earth Y into scrap copper and 72.5Cu-22.7Zn-3.4Al brass to research their structure and characteristics, especially the electric conductivity for scrap copper and HV for the brass were researched. The results show that the tensile strength, elongation and electric conductivity (IACS) of 0.38 mm strip of scrap copper with 0.04% Y, are 213.8 MPa, 23% and 98.5% that suit for the elastic components. The tensile strength, elongation and HV of 0.25mm strip of the brass with 0.03% Y are 665.1MPa, 2.86% and 226 that satisfy the usage requirement for the elastic components. Meanwhile, the cost is cheaper than phosphorous bronze because of implying 22.7% zinc in the brass, which has the actual application value. 相似文献
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在铝黄铜(72.5Cu-22.7Zn-3.4Al)中添加微量钴(0.2%,0.4%,0.6%),研究微量钴、熔炼铸造工艺及加工工艺参数对轧制法生产的带材的机械性能的影响。探索采用铝黄铜替代目前广泛使用的弹性铜合金材料-锡磷青铜的可行性。研究结果显示:钴能有效减少铸态合金的晶粒尺寸、改变晶粒的形状,提高合金的抗拉强度、硬度,并保证合金具有较好的延展性。铝黄铜中添加0.4%钴,采用合理的加工工艺生产出的黄铜带具有比锡磷青铜更优异的性能,0.25mm厚的带材,其抗拉强度可达840.4MPa,伸长率为2.8%,维氏硬度值为228,比特硬状态的QSn6.5-0.1带材的抗拉强度最大值(805MPa)提高了4.4%,满足弹性元件的使用要求;同时,由于该黄铜中含有22.7%的锌,可有效降低成本,具有实际应用价值。 相似文献
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采用区熔定向凝固法制备目标成分为Fe72.5Ga27.5的磁致伸缩定向生长试样. 采用改进的交流阻抗法测定定向生长态及其淬火态(1000 ℃/3 h, W. Q.)试样的阻抗谐振频率谱, 求出不同偏振磁场和预压力情况下的动态机电耦合系数K33. 由于Fe--Ga合金的磁致伸缩性能比Tb--Dy--Fe巨磁致伸缩材料小一个数量级, 原有的测试方法不易得到Fe--Ga合金的K33. 本实验在拾取信号时采用了四线并接接线方式并将交流激励信号输入水平调整到0.5 A, 获得了稳定且明显的Fe--Ga合金阻抗谐振频率谱线. 实验结果表明: 定向生长试样在32.7 mT偏振磁场、无预压应力下K33为0.103; 淬火态试样在同样偏振磁场和无预压应力下
K33达到0.137. K33随外加偏振磁场的增大而减小, 随预压力的增大呈现先增大而后减小的趋势. 淬火态试样的K33较定向生长试样有明显提高. 外加偏振磁场和预压力对淬火态试样的K33的影响规律同定向生长试样一致. 相似文献
K33达到0.137. K33随外加偏振磁场的增大而减小, 随预压力的增大呈现先增大而后减小的趋势. 淬火态试样的K33较定向生长试样有明显提高. 外加偏振磁场和预压力对淬火态试样的K33的影响规律同定向生长试样一致. 相似文献
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利用差热分析仪和X射线衍射仪研究了非晶合金Co72.5Fe1.5Mn4Si5B17的晶化行为。结果表明,该非晶合金有两个晶化阶段,第一阶段的起始晶化温度为419.0℃,峰值温度为431.4℃,第二阶段的峰值温度为583.6℃。在430-490℃间退火30min后,析出Co的立方相;在550~600℃之间退火30min,晶化相为Co的立方相、Co3B、Co2B、FeSi2和Mn3CO7。 相似文献
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