共查询到20条相似文献,搜索用时 171 毫秒
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非晶态合金具有强度、韧性以及耐磨性能优于普通晶态金属材料,耐蚀性好,磁抗小等优点,倍受材料科学和工程技术人员的关注,但是非晶态材料只有在非平衡条件下才能形成,加工难度大,阻碍了非晶态材料的发展和应用.对此,采用等离子弧喷涂方法制备铁基非晶合金,制备了Fe79Si10B11非晶态合金.对制备的非晶合金进行了XRD和TEM分析,并研究了喷涂过程中粒子的飞行温度和速度,通过传热学方法计算了喷涂过程中的粉末冷却速度.结果表明,所制备的非晶合金组织均匀,喷涂过程冷却速度达4.16×107 K/s. 相似文献
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Ti45Zr15Ni10Cu30大块非晶态合金的制备及热稳定性 总被引:1,自引:0,他引:1
直接用水冷快淬法成功制备直径2~5mm球状Ti45Zr15Ni10Cu30大块非晶态合金。X射线衍射(XRD)实验检验证明样品完全为非晶态。Ti45Zr15Ni10Cu30非晶合金于不同温度进行10min等温热处理,采用X射线衍射分析了Ti45Zr15Ni10Cu30非晶合金的晶化过程。 相似文献
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高压放电法制造非晶合金薄带高密度结合体非晶态合金具有优异的磁特性,耐蚀性和力学性能等特性,在利用其软磁特性的领域中已得到有效实用化,但是为了更广泛的工业应用,开发大块非晶态合金十分重要。在非晶态合金大块化方面,粉末的固化成形技术是有效的,但将非晶态合... 相似文献
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结合作者近年来在喷射成型法和吸铸法制备大块非晶合金中的研究结果,概述了当今大块非晶合金制备领域的最新研究成果.采用图文并茂的形式,较为详细地介绍了目前国内外研究和应用较为集中的采用液态金属凝固法制备大块非晶合金的方法和原理,并简要分析和比较了常用的液态金属凝固法制备大块非晶合金工艺的优缺点和适用材料.为从事亚稳态金属研究提供了详实的参考. 相似文献
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自从镧系金属基、镁基和锆基大块非晶态合金开发成功以来 ,近十年来又相继开发了一系列多元系大块非晶态合金 ,特别是锆基和钯 -铜基大块非晶合金已实际应用作为体育用品和电极材料。近来采用铜模铸造法成功地合成了Ni Nb Ti Zr基大块非晶合金 ,它不含类金属元素 ,具有高强度高韧性 ,而且耐蚀性好。日本东北大学的研究者新近系统地研究了Ni (Co )Nb Ti Zr系合金的非晶形成能力以及大块非晶态合金的热稳定性和腐蚀行为。研究用的是具有Ni6 0 -xCoxNb2 0 Ti10 Zr10 (x =0 ,5 ,10 ,15 ,2 0 ,30 ,4 0和 5 0 %原… 相似文献
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块体非晶合金是一类具有高强度、高硬度和大弹性极限的无序金属材料,其优异的力学性能是目前先进金属材料领域研究热点之一,如何提高材料的强度是材料研究领域永恒的主题。系统地总结了已知具有超高强度的一类块体非晶合金材料——钴基块体非晶合金的成分、热学稳定性及力学性能;同时研究了不同非晶合金的断裂强度与其弹性常数、硬度和特征温度的关联。研究结果表明:在非晶合金体系中杨氏模量、维氏硬度、玻璃转变温度与断裂强度之间都存在较好的线性变化关系。基于以上结果,本课题组提出了超高强钴基块体非晶合金的组成设计方法,即选取具有强共价键特性的非金属元素和高模量、高熔点过渡金属元素与钴元素进行组合。 相似文献
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《Acta Materialia》2008,56(13):3306-3311
Probability and statistics analyses are increasingly being used for reliability and durability assessments for life predictions of advanced material systems. Fatigue-life predictions have historically been based on crack-growth approaches, which are almost exclusively empirically based. Consequently, they often do not adequately reflect long-term operating conditions, which are well beyond laboratory test conditions. These models usually fail to identify the sources of the randomness and the extent of their contributions to the total variability. Using a simple crack-growth model, the variability inherent in the stress vs. fatigue-life (S–N) response for bulk-metallic glasses (BMGs) can be related to some of the key random variables that are readily identified in the models. The identification and quantification of these variables are paramount for predicting fatigue lives and reaching some understanding of the fundamental damage growth mechanisms in BMGs. The effectiveness of the modeling is shown through the analyses of a set of S–N data for BMGs where the variability associated with the material chemistry and structure and specimen preparation is considered. 相似文献
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The fracture toughness of bulk metallic glasses 总被引:1,自引:0,他引:1
Jian Xu Upadrasta Ramamurty Evan Ma 《JOM Journal of the Minerals, Metals and Materials Society》2010,62(4):10-18
Stiffness, strength, and toughness are the three primary attributes of a material, in terms of its mechanical properties.
Bulk metallic glasses (BMGs) are known to exhibit elastic moduli at a fraction lower than crystalline alloys and have extraordinary
strength. However, the reported values of fracture toughness of BMGs are highly variable; some BMGs such as the Zr-based ones
have toughness values that are comparable to some high strength steels and titanium alloys, whereas there are also BMGs that
are almost as brittle as silicate glasses. Invariably, monolithic BMGs exhibit no or low crack growth resistance and tend
to become brittle upon structural relaxation. Despite its critical importance for the use of BMGs as structural materials,
the fracture toughness of BMGs is relatively poorly understood. In this paper, we review the available literature to summarize
the current understanding of the mechanics and micromechanisms of BMG toughness and highlight the needs for future research
in this important area. 相似文献
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We report that Ca-Cu-Mg bulk metallic glasses (BMGs) can be fabricated at the region of multiple quasi-peritectic reactions by a conventional copper mold casting method, demonstrating that finding a deep eutectic composition is not the sole solution for the fabrication of BMGs. Unusual relationship between the glass transition temperature and the elastic constants of these BMGs were discussed in comparison with other BMGs. These results have implications for exploring new BMGs and understanding the glass formation mechanism. 相似文献
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《Intermetallics》2006,14(6):592-595
We report a family of ternary Gd–Al–Co alloys based on the heavy gadolinium rare earth element can be readily cast into fully glassy rod by a conventional casting method. It is found that the bulk metallic glasses (BMGs) have much high thermal stability (i.e. high glass transition temperature and crystallization temperature) and high moduli compared with those of other known rare-earth based BMGs. It is confirmed that, in addition to the strong chemical interaction among the components, the high bulk modulus of the base component in the BMGs is dominantly responsible for the high thermal stability. The thermal stability is correlated with the bulk modulus of the base element in the rare earth based BMGs. 相似文献
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近年来,为了满足具有大尺寸复杂结构的非晶合金构件的市场需求,具有高度柔性化成形、机加工量小和成形精度高等特点的增材制造技术被成功应用于制备块体非晶合金。本文基于国内外块体非晶合金增材制造成形领域的最新研究成果及作者们多年来在该领域的研究工作,系统介绍了现有非晶合金增材制造技术的研究现状,详细阐述了非晶合金在各类增材制造技术中的成形机理和性能方面的研究进展,深入探讨了现有非晶合金增材制造成形的技术难点,详细阐明了非晶合金增材制造成形工艺 - 组织结构 - 性能间内在联系,指出制备高质量高性能非晶构件将是块体非晶合金增材制造成形领域未来研究的重要方向。 相似文献
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采用铜模铸造法制备出一系列Zr-Al-Ni-Cu块体非晶合金,其脆性参数值分别采用Arrhenius和Vogel-Fulcher-Tammann (VFT)方法进行计算。结果表明,这些非晶合金具有低的脆性参数值,其原因可能与网络状的微观结构有关。另外,Zr-Al-Ni-Cu合金的脆性参数值可以通过Zr含量进行调整,当Zr含量接近54%(摩尔分数)时,Zr-Al-Ni-Cu合金,即Zr 54 Al 13 Cu 18 Ni 15合金的脆性参数值最小,约为13。 相似文献
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《Intermetallics》2017
In this work, we successfully prepare Fe80(P, C, B)20 bulk metallic glasses (BMGs) with the different content of P, C, B by combining fluxing treatment and J-quenching technique, and the effects of the metalloid elements (P, C, B) on the thermal stability and magnetic properties of the present Fe80(P, C, B)20 BMGs are investigated systematically. It is found that the replacements of P or B by C and P by B enhance the thermal stability of Fe80(P, C, B)20 BMGs. The substitutions of B for C or P and C for P result in the increase of both the saturation magnetization and the Curie temperature of Fe80(P, C, B)20 BMGs. 相似文献
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Zr-based amorphous alloys with a high glass-forming ability and thermal stability were discovered in 1990. In the following years, the alloy design increased the critical casting thickness to several centimeters, and a homogeneous dispersion of nanoscale particles was found to improve the ductility. Therefore, Zr-based bulk-metallic glasses (BMGs) are being studied widely because of their potential as structural materials. The fatigue behavior is an important characteristic of structural materials. The current review documents the fatigue studies of Zr-based BMGs and their composites. The fatigue characteristics of these alloys in different loading conditions and environments are summarized and compared in this paper. The factors affecting the fatigue behavior of the Zr-based BMGs and their composites are discussed. The mechanisms of fatigue-crack initiation and propagation in BMGs are addressed in this review. In order to broaden the scope of applications of BMGs, a fundamental understanding of the fatigue behavior is important for the design of new alloy systems and the development of the processing techniques. 相似文献