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On the effect of texture on the mechanical and damping properties of nanocrystalline Mg-matrix composites reinforced with MAX phases

机译：织构对MAX相增强纳米晶Mg基复合材料力学和阻尼性能的影响

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Herein, we report on the effect of texture on kinking nonlinear elasticity, damping capability, Vickers microhardness and ultimate compressive strengths of nanocrystalline (NC) Mg-matrix composites reinforced with 50vol.% Ti_2AlC Because all composite and bulk Ti_2AlC samples tested herein traced fully reversible, reproducible, hysteretic stress-strain loops during uniaxial cyclic compression tests, they were classified as kinking nonlinear elastic (KNE) solids. When the results were analyzed using our recently developed microscale incipient kink band (IKB) model, the various relationships predicted among the three independently measured values - stress, nonlinear strain and dissipated energy per cycle per unit volume, W_d - were exceptionally well adhered to. In all composites, and despite very different loops' shapes and sizes, the critical resolved shear stresses of basal plane dislocations in Ti_2AlC, calculated from the model fell within the narrow range of 37.7 ±0.5 MPa. The same was true for the reversible dislocation density that fell in the quite narrow range of 1.1 ±0.3 × 10~(14) m~(-2), suggesting the presence of an equilibrium state to which all systems migrate. Because kinking is a form of plastic instability, it was hypothesized that orienting the Ti_2AlC grains, prior to infiltration, with their basal planes parallel to the loading direction should lead to exceptionally high values of W_d. Indeed, at 450 MPa, W_d of the composite with this texture was found to be ≈0.6MJ/m~3, a value that exceeds the previous record of ≈0.4MJ/m~3 at 475 MPa reported for a randomly oriented composite. At 700 ±10 and 380 ±20 MPa, the ultimate compressive and tensile strengths of the composites were higher than those reported in the literature, Mg-Ti_3SiC_2 and Mg-SiC composites, in which the Mg-matrix grains were not at the nanoscale.
机译：本文中，我们报告了织构对用50vol。％Ti_2AlC增强的纳米晶（NC）Mg基质复合材料的纽结非线性弹性，阻尼能力，维氏显微硬度和极限抗压强度的影响，因为此处测试的所有复合材料和块状Ti_2AlC样品均可完全逆转，在单轴循环压缩试验中可重现的滞回应力-应变环，它们被归类为扭结非线性弹性（KNE）固体。当使用我们最近开发的微尺度初始扭结带（IKB）模型分析结果时，三个独立测量值之间的各种关系预测值-应力，非线性应变和每单位体积每周期的耗散能量W_d-都得到了很好的遵守。在所有复合材料中，尽管环的形状和尺寸相差很大，但通过模型计算得出的Ti_2AlC基面位错的临界分辨剪切应力落在37.7±0.5 MPa的狭窄范围内。对于可逆位错密度落在1.1±0.3×10〜（14）m〜（-2）的较窄范围内，情况也是如此，这表明存在所有系统迁移至的平衡态。由于纽结是塑性不稳定性的一种形式，因此可以假设，在渗透之前将Ti_2AlC晶粒定向，使其基面平行于加载方向，会导致W_d值异常高。实际上，在450 MPa时，发现具有这种织构的复合材料的W_d为≈0.6MJ/ m〜3，该值超过了先前报道的在475 MPa时≈0.4MJ/ m〜3的随机取向复合材料的记录。在700±10和380±20 MPa时，复合材料的极限抗压强度和拉伸强度高于文献中报道的Mg-Ti_3SiC_2和Mg-SiC复合材料，其中Mg-基体晶粒不在纳米级。

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