High strength Al metal-matrix microcomposite wire with 20 vol% Nb and ultimate tensile strengths up to 1030 MPA
High strength Al metal-matrix microcomposite wire with 20 vol% Nb and ultimate tensile strengths up to 1030 MPA
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高%20强度%20Al%20金属基体%20微复合材料%20线%20with%2020%20vol%%20Nb%20和%20终极%20拉伸%20强度%20up%20至%201030%20MPA
DOI：
10.1016/0956-716x(93)90055-w
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
S. Foner
中科院分区：
文献类型：
--
作者：
C. Thieme;S. Pourrahimi;S. Foner
在传统的复合材料结构中，性能F通常可以通过混合规则（ROM）与各个组分的性能相关。第二金属B精细分散的金属基质结构可以具有强烈偏离ROM的性质。已经广泛研究了几种二元体系，特别是Cu-Nb和Ag-Cu。这些二元混合物通常通过铸造或粉末冶金来生产。粉末冶金（PM）路线允许在不熔化的情况下生产坯料，并且可以防止固溶体的形成。通过挤压和拉丝对这些铸件或PM坯料进行高应变的机械变形产生少数相的非常细的细丝尺寸。这些微复合材料具有在10-200 nm或更小范围内的细丝厚度。在高[eta]（应变）下，混合物的极限拉伸应力（UTS）超过用混合物UTS规则[sub ROM]计算的UTS。为了进行正确的UTS[sub ROM]计算，必须使用在相当范围内应变的纯组分的UTS值。在最近的一项研究中，Spitzig测得变形至[eta] = 11.5的铸造Nb的UTS为1400 MPa。在本工作中，使用Nb粉末的100%Nb线材，变形至[eta] = 12.8，具有1440 MPa的UTS。对于铜，作者假设[eta] = 11.5时为495 MPa（1）。作者在Al-Nb粉末冶金线材中发现了类似的强化效果。在Al为主要相的线材中测量强化，但也在Nb为主要相的线材中测量强化。
In conventional composite structures a property F can often be related to the properties of the individual components through the rule of mixtures (ROM). Metal-matrix structures in which the second metal B is finely dispersed can have properties that deviate strongly from the ROM. Several binary systems have been extensively investigated, notably Cu-Nb and Ag-Cu. These binary mixtures are typically produced by means of casting or powder metallurgy. The powder metallurgy (PM) route allows the production of a billet without melting, and can prevent the formation of solid solutions. Mechanical deformation to high strains of these casts or PM billets by extrusion and wire drawing produces a very fine filament size of the minority phase. These microcomposites have a filament thickness in the range of 10-200 nm or less. At high [eta] (strain) the ultimate tensile stress (UTS) of the mixtures exceeds the UTS calculated with the rule of mixtures UTS[sub ROM]. For proper UTS[sub ROM] calculations UTS values of the pure constituents that have been strained over a comparable range must be used. In a recent study Spitzig measured a UTS of 1400 MPa for cast Nb deformed to [eta] = 11.5. In the present work a 100% Nb wire using Nb powder, deformed to [eta] = 12.8, had a UTS of 1440 MPa. For cu the authors assumed 495 MPa (1) at [eta] = 11.5. The authors found similar strengthening effects in Al-Nb PM wires. The strengthening is measured in wires in which Al is the majority phase, but also in wires with Nb as the majority phase.