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首页> 外文期刊>Journal of Materials Research >Synthesis and elastic and mechanical properties of Cr_2GeC
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Synthesis and elastic and mechanical properties of Cr_2GeC

机译：Cr_2GeC的合成及其力学性能

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Herein we report on the synthesis and characterization of Cr_2GeC, a member of the so-called M_(n+1)AX_n (MAX) phase family of layered machinable carbides and nitrides. Polycrystalline samples were synthesized by hot pressing pure Cr, Ge, and C powders at 1350 ℃ at～45 MPa for 6 h. No peaks other than those associated with Cr_2GeC and Cr_2O_3, in the form of eskolaite, were observed in the x-ray diffraction spectra. The samples were readily machinable and fully dense. The steady-state Vickers hardness was 2.5 ±0.1 GPa. The Young's moduli measured in compression and by ultrasound were 200 ± 10 and 245 ± 3 GPa, respectively; the shear modulus and Poisson's ratio deduced from the ultrasound results were 80 GPa and 0.29, respectively. The ultimate compressive strength for a～20 μm grain size sample was 770 ± 30 MPa. Samples compressively loaded from 300 to～570 MPa exhibited nonlinear, fully reversible, reproducible, closed hysteretic loops that dissipated ～20% of the mechanical energy, a characteristic of the MAX phases, in particular, and kinking nonlinear elastic solids, in general. The energy dissipated is presumably due to the formation and annihilation of incipient kink bands. The critical resolved shear stress of the basal plane dislocations-estimated from our microscale model-is -22 MPa. The incipient kink band and reversible dislocation densities, at the maximum stress of 568 MPa, are estimated to be 1.2 × 10~(-2) μm~(-3) and 1.0× 10~(10) cm~(-2), respectively.
机译：在这里，我们报告了Cr_2GeC的合成和表征，Cr_2GeC是层状可加工碳化物和氮化物的所谓M_（n + 1）AX_n（MAX）相家族的成员。通过在1350℃〜45 MPa下热压纯Cr，Ge和C粉末合成6h多晶样品。在x射线衍射光谱中没有观察到与依古钙石形式的与Cr_2GeC和Cr_2O_3有关的峰。样品易于加工且完全致密。稳态维氏硬度为2.5±0.1 GPa。压缩和超声测得的杨氏模量分别为200±10 GPa和245±3 GPa。由超声结果推导出的剪切模量和泊松比分别为80 GPa和0.29。 a〜20μm粒度样品的极限抗压强度为770±30 MPa。在300至570 MPa的压缩载荷下，样品表现出非线性的，完全可逆的，可再现的闭合磁滞回线，其耗散了约20％的机械能，特别是MAX相的特征，并且通常会扭结非线性弹性固体。耗散的能量大概是由于初始扭结带的形成和an灭。从我们的微尺度模型估计的基面位错的临界解析剪切应力为-22 MPa。在最大应力为568 MPa时的初始扭结带和可逆位错密度估计为1.2×10〜（-2）μm〜（-3）和1.0×10〜（10）cm〜（-2），分别。

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