共查询到18条相似文献,搜索用时 93 毫秒
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在已开发的合金体系中,Mg-TM-RE合金系(TM为过渡元素,RE为稀土元素)为主要合金系。在总结近年来开发的Mg-TM-RE块体金属玻璃的形成体系及其形成能力的基础上,分析和讨论了合金元素TM及RE对Mg基块体金属玻璃形成能力的影响,为进一步研发Mg-TM-RE系金属玻璃提供合金设计思路。 相似文献
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通过调控金属玻璃的原子尺度结构进而提高它们的力学、物理、化学性能极为重要。在过去几十年里,金属玻璃领域研究者投入了大量精力以开发有效调控方法,如深冷处理。本文综述了深冷处理对金属玻璃性能的影响及其对初始结构能量状态的依赖关系,聚焦了金属玻璃中原子结构随深冷处理的演化,这些内容对于深入理解金属玻璃深冷处理效应具有重要作用。 相似文献
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Nd60Al10Fe20Co10金属玻璃的变形行为 总被引:2,自引:0,他引:2
利用材料测试系统(MTS)、X-Ray衍射(XRD)和扫描电镜(SEM)等手段研究了Nd基大块金属玻璃的变形行为和断裂特征.Nd基大块金属玻璃样品在室温下是脆性断裂,大约在500 K时变形模式从非均匀变形转变为均匀变形,在523 K以上表现出显著的塑性变形.在5×10-4 m/s的应变速率下,这种Nd基大块金属玻璃材料在523 K~600 K之间出现明显的屈服应力下降现象,随后进入1种稳定的粘性流动状态,而且这种屈服下降现象与温度和应变速率有关.这种在过冷液相区的变形行为与其他大块金属玻璃变形特征相似.合金的这种塑性变形行为表明了其存在稳定的过冷液相区,同时对其变形行为的研究有助于进一步了解Nd基大块金属玻璃的反常热稳定性. 相似文献
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陈刚 《特种铸造及有色合金》2006,26(7):424-427
从发展过程、制备、性能、复合材料等几个方面,对镁基大块金属玻璃的研究进展进行了回顾,并对镁基大块金属玻璃研究中遇到的问题和镁基大块金属玻璃的发展前景进行了探讨,认为在重视开发新型镁基大块金属玻璃的同时,必须不断探索镁基大块金属玻璃制品的开发和商业应用。 相似文献
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金属玻璃具有优异的力学、物理、生物和化学性能以及良好的耐磨损、耐腐蚀性能等,因此其在工程和功能材料领域有广阔的应用前景.基于高度局域化的剪切带变形模式,金属玻璃在室温条件下呈现脆性特征和应变软化等问题限制了其应用潜力.改善和提高金属玻璃的力学性能,可通过改变金属玻璃变形能力的影响因素来实现.采用不同制备工艺、试验条件及后续处理工艺能够在一定程度上提高金属玻璃变形能力.因此,系统介绍金属玻璃变形能力影响因素以及如何通过调整这些影响因素来提高金属玻璃变形能力至关重要.本文综述了影响金属玻璃变形能力的内、外在因素,并重点评述了金属玻璃变形能力提高的主要途径.最后,对金属玻璃的改性途径进行了简单总结,并对该领域需要进一步研究的若干问题进行了展望. 相似文献
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In this research, corrosion behavior, mechanical properties and bioactivity of Ti–Zr–Cu–Pd–Sn bulk metallic glasses with minor addition of Au, Pt, Nb or Ta elements were investigated. The results revealed that minor additions of the elements were beneficial to enhancing mechanical properties and corrosion resistance of Ti-based bulk metallic glasses.Minor addition of the element(especially with Nb and Ta addition) results in the improvement in plastic deformation ability due to the existing of nanoparticles with a size smaller than 10 nm in glassy matrix, inhibiting the deformation of the shear bonds. Enrichments of Ti and Zr elements in oxide layer were responsible for high corrosion resistance. The bioactivity of Ti-based bulk metallic glasses was also investigated. The best combination of large plastic deformation ability, good corrosion resistance and bioactivity in Ti_(40)Zr_(10)Cu_(33)Pd_(14)Sn_2Ta_1 BMG was obtained. 相似文献
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Design of Bulk metallic glasses with high glass forming ability and enhancement of plasticity in metallic glass matrix composites: A review 总被引:1,自引:0,他引:1
To overcome some of the limits of existing metallic alloys, a new alloy design concept has been introduced recently in order
to control the crystallinity, i.e. to utilize crystalline, quasicrystalline, and amorphous structures. In particular, bulk
metallic glasses (BMGs) receive great attention because of their unique properties due to their different atomic configuration.
Recently, significant progress in enhancing glass forming ability (GFA) has led to the fabrication of BMGs having potential
for application as structural and functional materials. Moreover, successful design of BMG matrix composite microstructure
suggests that the plasticity of BMGs can be controlled properly. In this review article, we introduce recent research results
on the design of BMGs with high GFA and on the enhancement of plasticity in metallic glass matrix composites. 相似文献
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J. Das S. Pauly M. Bostrm K. Durst M. Gken J. Eckert 《Journal of Alloys and Compounds》2009,483(1-2):97
To circumvent the limited plasticity of bulk metallic glasses (BMGs), heterogeneous materials with glassy matrix and different type and length-scale of heterogeneities (micrometer-sized second phase particles or fibers, nanocrystals in a glassy matrix, phase separated regions, variations in short-range order by clustering) have been reported. We developed bulk metallic glasses and glass matrix composites in martensitic Zr–Cu-base alloys. Large plasticity can be obtained from microstructure consisting of either a glassy structure, or for alloys with martensitic second phase embedded in a glassy matrix. This type of glasses and glass–matrix composites are able to achieve high strength together with pronounced work-hardening. We explore the possibilities to synthesize such in situ composite microstructures based on shape memory alloys (“M-Glasses”) through metal mold casting. 相似文献
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Zhao Yanchun Sun Hao Li Chunling Jiang Jianlong Mao Ruipeng Kou Shengzhong Li Chunyan 《金属学报》2018,(12):1818-1824
Room-temperature brittleness and strain-softening during deformation of bulk metallic glasses, and limited processability of shape memory alloys have been stumbling blocks for their advanced functional structural applications. To solve the key scientific problems, a new shape memory bulk metallic glass based composite, through the approach using transformation-induced plasticity (TRIP) effect of shape memory alloys to enhance both ductility and work-hardening capability of metallic glasses, and superplasticity of bulk metallic glass in supercooled liquid region to realize near net forming, was developed in this work. And the Ti-Ni base bulk metallic glass composites (BMGCs) rods were prepared by the levitation suspend melting-water cooled Cu mold process. Microstructure, thermal behavior, mechanical properties and high temperature deformation behavior of the alloy were investigated. The results show that the as-cast alloy microstructure consists of amorphous matrix, undercooled austenite and thermally-induced martensite. Besides, the size of the crystal phase precipitated on the amorphous matrix in-creases from the surface to the inside. The alloy exhibits excellent comprehensive mechanical properties at room temperature. The yield strength, fracture strength and the plastic strain of alloy are up to 1286 MPa, 2256 MPa and 12.2%, respectively. Under compressive loading in the supercooled liquid region, the composite exhibits approximate Newtonian behavior at lower strain rate in higher deformation temperature, and the optimum deformation temperature is T>480 degrees C and the intersection part with supercooled liquid region (SLR). When the temperature is 560 degrees C and the strain rate is 5x10(-4) s(-1), the stress sensitivity index m and the energy dissipation rate Psi are 0.81 and 0.895, respectively. Furthermore, the volume of activation is quantified to characterize the rheological behavior. 相似文献
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Effects of nitrogen addition on glass formation and mechanical properties of the Ti42.5Cu40Zr10Ni5Sn2.5metallic glass were systematically investigated. It was found that a small amount of nitrogen addition facilitated the glass formation by suppressing formation of the competing eutectic structure. Unlike large atomic size elements such as Hf and Pd which usually deteriorate specific strength, nitrogen can also increase the specific strength of the current Ti-based BMGs. The results are not only helpful for understanding glass-forming ability in general, but also useful in developing cost-effective, high-performance Ti-based bulk metallic glasses with enhanced glass-forming ability. 相似文献
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王美玲 《稀有金属材料与工程》2016,45(12):3255-3261
采用单辊真空薄带技术和真空吸铸法分别制备了相同成分的金属玻璃薄带和块体金属玻璃。通过示差扫描热分析(DSC)、X射线衍射(XRD)、高分辨透射电子显微镜(HRTEM)和纳米力学探针(Nano Indenter)等技术研究了冷却速度对金属玻璃的组织结构、热稳定性及力学性能的影响。结果表明:快速冷却得到的金属玻璃薄带和相同成分以较慢的冷却速度制备的块体金属玻璃相比,短程有序结构(SRO)的晶体结构相同,但数量较少,且自由体积含量相对较多;组织结构的差异导致金属玻璃薄带比块体金属玻璃有着更高的热稳定性、屈服强度,弹性模量和硬度。 相似文献
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For the mass production of bulk metallic glasses, the use of industrial raw materials that contain certain amounts of inclusions
is inevitable. The glass-forming ability of bulk metallic glasses, i.e., the critical cooling rate for glass formation upon
solidification, is closely related to the nature of heterogeneous nucleation offered by inclusions during the solidification
process. Significantly different effects of various types of inclusions on the glass forming ability of the alloy Fe68.8C7.0Si3.5B5.0P9.6Cr2.1Mo2.0Al2.0 are demonstrated in this study. The origins of the effects of different inclusions on the glass forming ability are analyzed
through thermodynamic, crystallographic and classical heterogeneous nucleation kinetic theories. 相似文献