铁基非晶态合金防脆化方法研究EI

选用近共晶成分的合金和在合金中添加适量稀土元素Ｃｅ，以及用高液淬速率制备出超薄带，皆有益于降低铁基非晶合金退火脆化敏感性。用脉冲电流对铁基非晶条带进行快速加热退火，可在明显改善磁性的同时，使条带仍保持足够的变形能力；是实现铁基非晶合金磁性优化与良好延性配合的有效工艺。     

液淬条件对非晶态合金制备脆化和晶化的影响

研究了用单辊法制备非晶态合金条带时，冷却辊表面线速、熔体射流压力、喷射距离等参数对非晶态Ｆｅ３０Ｂ１１．４Ｓｉ３．５合金条带的形成、条带结构、性能及其退火脆化和晶化的影响。液淬工艺参数的合理配合下获得的足够高的液淬速率是得到非晶结构的关键，也是制备质量条带的决定因素。液淬速率愈高，条带厚度愈小，其脆化敏感性愈低。因此，高液淬速率下薄带的制备，有益于提高非晶态合金脆化抗力。非晶合金的晶化与液淬条件之间不存在直接的联系。     

非晶态合金的退火脆化及其影响因素

本文综合论述了非晶态合金的退火脆化具有明显的成分依赖性，并对组织结构和制备工艺比较敏感。微量杂质元素的偏聚显著增大合金的脆化倾向，而微量稀土铈的适当添加则可以明显减轻质元素的不利影响，使延性得到改善。快速退火滞后了合金结构的变化过程，可有效地抑制磁性优化退火过程中非晶态合金的延－脆转化的发生。     

非晶态合金的退火脆化及其影响因素

本文综合论述了非晶态合金的退火脆化具有明显的成分依赖性，并对组织结构和制备工艺比较敏感。微量杂质元素的偏聚显著增大合金的脆化倾向，而微量稀土元素铈的适当添加则可以明显减轻杂质元素的不利影响，使延性得到改善。快速退火滞后了合金结构的变化过程，可有效地抑制磁性优化退火过程中非晶态合金的延—脆转化的发生。     

电脉冲快速退火对铁基非晶合金性能的影响

采用大电流交流脉冲对非晶Ｆｅ７８Ｂ１３Ｓｉ９合金进行了去应力退火。初步探讨了电脉冲加热对加热速率和该合金内应力释放、退火脆化以及最终软磁性影响的基本规律。结果表明：电脉冲加热可以得到远高于常规退火的加热速率，选择合适工艺参数可使非晶合金内应力释放９０％，软磁性（Ｈ＿ｃ和Ｂ＿ｓ）达常规退火后的９５％以上，与此同时使合金的延性（断裂应变ε＿ｆ）维持在０．９以上，从而有望实现非晶合金磁性与延性的合理配合。     

Ce对非晶态Fe76B15Si9合金脆化及晶化的影响

在非晶态Ｆｅ７６Ｂ１５Ｓｉ９合金中加入Ｃｅ可明显改变合金的退火脆化倾向，Ｃｅ与杂质元素化合生成高熔点的化合物，在晶化过程中成为晶体形成的核心，加快了非均匀成核速率，降低了开始发生晶化的温度，但对其晶化反应进行顺序及晶化产物不产生影响。     

钛合金的银脆,镉脆敏感性及其控制

利用慢应变速率拉伸技术（ＳＳＲＴ），并结合恒载实验，较全面地研究了Ｔｉ－６Ａｌ－４Ｖ合金的银脆行为、固态与液态镉脆行为，确定了应变速率、接触条件、热处理制度、试样取向、温度等因素对Ｔｉ－６Ａｌ－４Ｖ合金银脆与镉脆敏感性的影响，探讨了Ｎｉ阻挡层对控制Ｔｉ－６Ａｌ－４Ｖ合金和ＴＣ１１合金银脆开裂的作用。     

掺杂合金元素法抑制金属中氦脆的研究进展

聚变堆结构材料极易因α粒子和中子辐照引入大量的He原子而脆化,降低核设施的稳定性和安全性,因此必须提高材料的抗氦脆能力.添加合金元素法是一种有效抑制金属中氦脆的方法.然而,合金元素对金属中的氦脆抑制效果受到原子占位情况、原子尺寸大小、浓度、温度等因素影响.因此,掺杂合金元素时必须考虑合金元素的种类和含量,并辅以一定的热处理.回顾了掺杂合金元素法抑制金属中氦脆的研究进展,简要分析了影响合金元素在金属中氦行为角色的因素.     

局部脆化区对结构冷脆行为的影响

以１６Ｍｎ钢落锤试样进行了系列温度下的静载弯曲试验，发现在母材的冷脆特征温度Ｔｃ处，局部脆化区的启裂对结构断裂强度的影响作用发生明显转折。     

低碳钢焊接接头碱脆破裂的研究

本文叙述了用多种试验方法测试评定低碳钢焊接接头对碱脆破裂的敏感性。提出低碳钢焊接结构防止碱脆破裂的基本措施是消除焊后残留应力。     

A new method for stress relieving amorphous alloys to improve magnetic properties

An analysis of the kinetics of stress relief annealing in amorphous alloys, with particular emphasis on the effect of annealing on the resulting magnetic properties, is made. Based on this analysis, an optimal procedure for annealing amorphous alloy magnetic cores is suggested. It involves a fast heatup to a high temperature for a short time. The expected benefits of this procedure are decreased embrittlement, lower strain induced anisotropy, and lower residual stresses. The conventional technique for stress relieving magnetic cores proved unsuitable for the application of the new annealing treatment. A new technique was devised in which the ribbon is dynamically annealed as it is wound onto the core. The magnetic properties of the resulting toroids are superior to those produced by the conventional technique.     

Influence of thermomagnetic treatment on the propagation velocity of magnetoelastic oscillations and the ΔE effect in disordered ferromagnetics

An investigation was made of the propagation velocity of magnetoelastic oscillations and the ΔE effect as a function of the magnetic annealing temperature and the external magnetic field in iron-based amorphous metal alloys. It is shown that this dependence is nonmonotonic. The extreme values of the propagation velocity of the magnetoelastic oscillations and the ΔE effect only coincide in a specific range of annealing temperatures. As the annealing temperature increases, the extreme values of the magnetoelastic characteristics shift toward larger magnetic fields. Pis’ma Zh. Tekh. Fiz. 24, 79–83 (August 26, 1998)     

An Overview of Hydrogen Interaction with Amorphous Alloys

Theories, experimental results and applications associated with hydrogen behavior in amorphous metals and alloys are reviewed. An emphasis is made on the potential use of these advanced materials for hydrogen storage technology. Therefore, several properties that are especially relevant for such applications are assessed. These include structural models for hydrogen occupancy, sorption characteristics, solubility, diffusion behavior and thermal stabilities. Hydrogen effects on the mechanical properties and fracture modes of glassy metals are also presented, and possible mechanisms of hydrogen embrittlement are discussed. Similarities and differences between hydrogen behavior in amorphous and crystalline metals and alloys are discussed in detail.     

Periodically Laser Patterned Fe?B?Si Amorphous Ribbons: Phase Evolution and Mechanical Behavior

The properties of amorphous alloys are significantly influenced by structural relaxation and partial/full crystallization induced by thermal annealing of the alloy. In this paper, the phase evolution and mechanical behavior of laser‐patterned Fe? B? Si amorphous alloys are reported. The laser patterning was employed to cause localized thermal effects on the surface of amorphous ribbons. The laser irradiation with a lower fluence (12 J · cm^?2) caused significant embrittlement of the alloy due to the structural relaxation. The partial crystallization of an amorphous alloy into α‐Fe(Si) was also observed with laser irradiation using higher laser fluences (15 and 17 J · cm^?2). The embrittlement effect due to laser‐irradiation‐induced crystallization was more severe than that due to structural relaxation.