共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
3.
4.
5.
6.
介绍了国外开发与研究锆合金的现状,着重概述了我国高性能锆合金的研究结果.我国在跟踪国际锆合金发展的同时,不但通过对锆-4合金耐腐蚀性能的改进研究,研制出了具有工艺代表性的改进型锆-4合金包壳材料,而且开发了2种新型锆合金.新型锆合金的堆外性能研究结果表明,其抗疖状耐腐蚀性能、抗吸氢性能大大优于锆-4合金,其他性能好于锆-4合金或与锆-4合金相当,新锆合金的综合性能明显优于锆-4合金. 相似文献
7.
作为核反应堆的燃料包壳,锆合金在水侧腐蚀的同时还因吸氢而产生氢化物,从而导致基体脆化和氢致延迟开裂等问题。本文综述了锆合金中的氢化物相和氢化物取向。重点讨论了γ相和δ相与锆及锆合金的晶体学取向关系,分析了织构、加工Q值、应力和退火温度对氢化物取向的影响,以及氢化物取向对锆合金力学性能的影响。同时概括了目前研究中存在的氢化物取向机理不明确、氢化物应力再取向机理存在争议等问题,指出了影响锆合金中氢化物取向的因素、氢化物与锆基体的晶体学取向关系、氢化物应力再取向机理等研究尚需进一步完善,此外,对于国产新型高性能锆合金氢化物的研究也有待深入开展。 相似文献
8.
9.
10.
11.
Magnesium alloys have wide applications in automobiles, aerospace and so on due to many advantages, while a number of undesirable
properties including poor corrosion resistance, inferior creep resistance and bad plastic processing ability have hindered
their applications. Creep-resistant magnesium alloy design, plastic processing of magnesium alloys and rapid solidification
processing of magnesium alloys have become the hot topics in magnesium technology. Other than these, surface modification
as well as laser beam welding are also involved. The research progress and development in magnesium technology in China are
reviewed in the paper. 相似文献
12.
Magnesium alloys have wide applications in automobiles, aerospace and so on due to many advantages, while a number of undesirable properties including poor corrosion resistance, inferior creep resistance and bad plastic processing ability have hindered their applications. Creep-resistant magnesium alloy design, plastic processing of magnesium alloys and rapid solidification processing of magnesium alloys have become the hot topics in magnesium technology. Other than these, surface modification as well as laser beam welding are also involved. The research progress and development in magnesium technology in China are reviewed in the paper. 相似文献
13.
14.
15.
Diffusion Bonding of Tungsten to Copper and Its Alloy with Ti Foil and Ti/Ni/Ti Multiple Interlayers
Guisheng ZOU Jun YANG Aaiping WU Genghua HUANG Deku ZHANG Jialie REN Qing WANG 《材料科学技术学报》2003,19(Z1)
Ti foil and Ti/Ni/Ti multiple interlayers were selected for the bonding of tungsten to copper and CuCrZr alloy. Theeffects of processing conditions on the microstructures and shear strength of the joints were investigated. 相似文献
16.
退火作为工业上控制和改变金属材料组织、结构和性能的重要手段,在生产中具有很重要的意义.采用电化学工作站研究了含稀土Ce的CuCrZr合金退火前后在氯化钠溶液中的电化学性能.结果表明,稀土元素Ce的添加有利于提高合金的耐蚀性.对于未退火的研究试样,Ce的添加降低了合金的腐蚀电流;而对于经过退火处理的试样,退火增加了合金在氯化钠溶液中的腐蚀电流,但Ce对耐蚀性的提高作用依旧存在,它的存在可减缓退火对合金耐蚀性的降低作用.同时,试样在1 mol/L NaCl水溶液中的阻抗谱表明:退火提高了试样表面产物膜的致密度,增加了腐蚀反应的难度. 相似文献
17.
AgCuZnSn钎料作为绿色环保型硬钎料,一直是国内外钎焊学术界和产业界关注的热点。主要对近20年国内外有关AgCuZnSn钎料的研究报道进行评述,首先对AgCuZnSn钎料体系进行概述,其次从制备方法角度对现有AgCuZnSn钎料的研究进行了归纳分析,然后详细综述了AgCuZnSn钎料合金化的研究进展,分析元素In、Ga、Ni、P、Mn、La及合金Ni-P、Ga-In、Ga-In-Ce的调控作用,最后提出AgCuZnSn钎料研究和应用过程中存在的不足,并对其未来发展的方向进行了展望,为新型AgCuZnSn钎料的进一步研究提供理论指导和参考信息。 相似文献
18.
19.
Yucel Birol 《Journal of Materials Science》2010,45(16):4501-4506
CuCrZr alloy offers good mechanical and thermal properties and was investigated in the present work for its potential as tooling
material in thixoforming of steels. Samples of CuCrZr alloy were cycled thermally between 450 and 750 °C, every 60 s. The
thermal conductivity of the CuCrZr alloy, nearly an order of magnitude higher with respect to that of the conventional hot
work tool steel, proved to be very beneficial in terms of thermal stresses generated at the surface upon thermal cycling.
The maximum compressive and tensile stresses produced at the front face of the CuCrZr alloy were estimated to be approximately
30 and 10 MPa, respectively, much smaller than those endured by the conventional hot work tool steel. The very favourable
thermal stress state in the CuCrZr alloy die was largely negated, however, due to its inferior resistance to high temperature
oxidation. 相似文献
20.
Thermal conductivity of a CuCrZr alloy containing of 0.71% of Cr and 0.23% of Zr was measured in the temperature interval from 5 K to 300 K. A method utilizing the measurement of thermal conductivity integral of a sample was verified and applied. Measurements of thermal conductivity, electrical resistivity at 4.2 K and 295 K and of Brinell hardness were performed on solution annealed, precipitation hardened and “as received” materials. The CuCrZr alloy was found to be applicable where high mechanical properties together with high and stable thermal conductivity are required. The possibility to predict the thermal conductivity of precipitation hardened copper alloys from the electrical properties even if the RRR values are lower than 10 was verified at RRR = 5. 相似文献