排序方式: 共有32条查询结果,搜索用时 15 毫秒
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研究了非晶Sm5Fe74.3Nb1.5Si11.7B4.5C2.5Cu0.5合金经400℃,保温10min预退火后的晶化动力学。结果表明;该合金的晶化相为α-Fe固溶体和Sm2Fe17Cx金属间化合物,两相的晶化表观激活能分别为557KJ/mol和514KJ/mol,当晶化体积分数为60%时,α-Fe相的晶化激活能达极大值;Sm2Fe17Cx相晶化激活能则随其晶化体积分数的增加而逐渐减小。 相似文献
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Effect of Rare Earth Elements on Thermal Fatigue Property of Low Chromium Semi-Steel 总被引:3,自引:0,他引:3
The effect of rare earth elements on eutectic carbide‘s morphology of low chromium semi-steel in as-cast state and after heat treatment was investigated, and accordingly, the thermal fatigue property of this material was studied. The results show that RE can improve the eutectic carbide‘s morphology, inhibit the formation and propagation of thermal fatigue cracks, therefore, promote the thermal fatigue property, which is more noticeable in case of the RE modification in combination with heat treatment. The optimal thermal fatigue property can be obtained when treated with 0.2% RE modification as well as normalization at 950℃ for 3h. 相似文献
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The effects of Zr on crystallization kinetics of Pr-Fe-B amorphous alloys have been investigated by DTA and XRD methods.It was found that for Pr8Fe86-xZrxB6(x=0,1,2)amorphous alloys,the final crystallized mixture is α-Fe and Pr2Fe14B,and the metastable Pr2Fe23B3 phase occurs during crystallization of Pr8Fe86B6 amorphous alloy,not during crystallization of Pr8Fe86-xZrxB6(x=1,2)amorphous alloys,By analyzing the activation energy of crystallization,the formation of an α-Fe/Pr2Fe14B composite microstructure with a coarse grain size in annealed Pr8Fe86B6 alloy,is attributed to a difficult nucleation and an easy growth for both the α-Fe and Pr2Fe14B in the alloy.The addition of Zr can be used to change the crystallization behavior of the α-Fe phase in Pr-Fe-B amorphous alloy,which is helpful to reduce the grain size for the α-Fe phase. 相似文献
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LSI渗硼剂渗硼中硼的扩散激活能 总被引:1,自引:0,他引:1
通过对40钢经不同温度及时间渗硼后渗层层深的测定,根据公式ρ^2=K0te^-Q/RT计算出硼的扩散激活能,为渗硼层形成机制的研究提供数据。 相似文献
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采用X射线衍射分析、透射电子显微分析技术及振动样品磁强计研究了ND3.6Pr5.4Fe83Co3B5合金熔体在不同淬速下α—Fe/Nd2Fe14B复合纳米晶结构的形成和磁性。结果表明.在淬速低于20m/s时随着淬速的升高Nd2Fe14B和α—Fe纳米晶的尺寸变得均匀、细小,α—Fe相的体积分数增加。当辊速由10m/s增加到20m/s时,Nd2Fe14B和α—Fe相的晶粒尺寸分别由51.2nm和30.2nm减小到13.4nm和16.3nm。α—Fe相的体积由31.9%增至48.6%,并在20m/s时获得了193.6kJ/m^3的最大磁能积。 相似文献
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空心微珠表面化学镀Ni-P合金及其吸波性能研究 总被引:1,自引:1,他引:1
采用化学镀法在平均粒径2 μm的空心微珠表面包覆了均匀完整的Ni-P非晶合金镀层,并对该材料进行了电磁性能和吸波性能测试.测试结果表明:空心微珠包覆Ni-P非晶合金镀层后矫顽力达到343.08Oe,属于电磁损耗型材料;以包覆后的空心微珠粉体为吸收荆制备吸波涂层,当涂层厚度为3 mm时,在4.32GHz达到最强吸收-20.81 dB,当涂层厚度为1.5 mm时,在8.56~10.08 GHz内出现了小于-10 dB的较宽吸收. 相似文献