共查询到17条相似文献,搜索用时 109 毫秒
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研究了加工态丝材和退火态丝材所加工的Ti45Nb合金铆钉的组织及性能。冷拉拔加工态钛铌丝材抗拉强度为680 MPa,剪切强度为390 MPa,且塑性良好,延伸率A为20%,断面收缩率Z为80%,具有良好加工性能。加工态丝材经退火后,组织实现完全再结晶,抗拉强度降低至550 MPa,塑性有所提高,延伸率A达到30%。两种状态丝材经冷镦加工成铆钉后,与丝材相比,剪切强度均增高,这与冷镦加工造成加工硬化有关;而对铆钉进行退火后,剪切强度均降低,且加工态丝材镦制的铆钉的剪切性能一致性优于退火态丝材镦制的铆钉。 相似文献
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多元复合稀土钼材的研究 总被引:2,自引:0,他引:2
介绍了通过粉末冶金方法在钼中掺杂1种稀土氧化物(简称单元稀土)和掺杂3种稀土氧化物(简称多元复合稀土)制取钼材的工艺要点,并对掺杂钼粉、坯条及不同温度退火丝材的性能和组织进行了研究。结果表明:多元复合稀土钼丝的生产工艺与纯钼丝生产工艺基本相同;多元复合稀土同单元稀土一样,都能大大提高钼丝的强度;多元复合稀土钼丝与同含量的单元稀土钼丝相比,多元复合稀土钼丝表现出优异的高温退火强度,具有更高的延伸率和可加工性。 相似文献
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本文通过扫描电镜,俄歇谱仪和金相显微镜等手段,对掺杂钼和纯钼的粉,条乃至丝材,进行横、纵向观察,其结果表明,掺杂钼丝的再结晶温度比纯钼丝高,在1800℃以上仍保持着良好的机械性能。文章初步探讨了高温退火处理后,仍具有良好机械性能的机制。研究表明:掺杂钼丝经高温退火后,晶粒表面形成了规则排列的钾泡,阻碍了掺杂钼丝再结晶晶粒的横向长大。使晶粒沿丝轴方向和无钾泡处生长,形成锯齿形长晶,这种晶粒间相互啮合搭接,导致了高温退火后的掺杂钼丝具有良好的塑性和弯曲性能;并且钾泡行密度和长度愈大,则再结晶晶形比值L/W(L为再结晶晶粒长度,W为宽度)愈大,其机械性能也愈好。 相似文献
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添加微量元素对钼丝组织与性能的影响 总被引:2,自引:0,他引:2
在试验的基础上,采用光学显微镜、电子显微镜及高温性能测试手段、力学性能测试手段系统地研究了掺杂硅铝钾元素对钼丝性能的影响及其机理。为掺杂钼丝的生产及应用提供了一定的理论依据。 相似文献
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Dopant particle characterization and bubble evolution in aluminum-potassium-silicon-doped molybdenum wire 总被引:1,自引:0,他引:1
L. E. Iorio B. P. Bewlay M. Larsen 《Metallurgical and Materials Transactions A》2002,33(11):3349-3356
The present article describes the creation of dopant inclusions in aluminum-potassium-silicon (AKS)-doped molybdenum powder
and the generation of potassium bubbles in doped molybdenum wire. Molybdenum wire is used extensively in the incandescent
lamp industry for coiling mandrels, filament support wires, and foil seals. The AKS-doped molybdenum wire is an important
product, because it possesses greater high-temperature strength and a higher recrystallization temperature than undoped molybdenum;
both of these properties are important for structural applications in lamps. The AKS-doped molybdenum wire is produced in
a similar manner to AKS-doped tungsten wire, but lower processing temperatures are typically used for the production of molybdenum
wire. Previous studies on AKS-doped tungsten wire have shown that the dispersion which provides the interlocking grain structure
in recrystallized tungsten wire is bubbles of elemental potassium; these enhance incandescent lamp filament life. However,
there is little previous work on the potassium-containing dispersion in AKS-doped molybdenum wire. In AKS-doped molybdenum,
the dispersion can be either potassium bubbles, or solid oxide particles, depending on the processing method. This article
will describe a series of analyses of doped molybdenum wire and its precursors, namely, doped powder and sintered ingots.
The roles of high- and low-temperature sintering are also described. 相似文献
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