Mechanical properties and machining performance of Ti1-xAlxN-coated cutting tools
Mechanical properties and machining performance of Ti1-xAlxN-coated cutting tools
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DOI：
10.1016/j.surfcoat.2004.04.056
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发表时间：
2005-02-21
影响因子：
5.4
通讯作者：
Karlsson, L
中科院分区：
文献类型：
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作者：
Hörling, A;Hultman, L;Karlsson, L
已经研究了Ti1-Xalxn涂层切割工具的机械性能和加工性能。使用具有一系列组成范围的阴极通过电弧蒸发处理，以获得具有组成X = 0的涂层，x = 0.25，x = 0.33，x = 0.50，x = 0.50，x = 0.66和x = 0.74。无XLESS的涂层超过或等于0.66具有亚稳态结构，而X = 0.74产生的两相涂层由立方体和六边形结构组成。通过纳米压力，扫描电子显微镜（SEM）和X射线衍射（XRD）来表征供应和等热退火涂层。还进行了切割测试，揭示了工具磨损机制。结果表明，Al含量X促进了A（200）优选的晶体学取向，并且对散布涂层的硬度有很大影响。保留了高硬度（类似于37 GPA）和AS沉积的TI1-XALXN涂层的质地，用于退火温度最高950摄氏度，这表明与TI和TI（C，N）涂层相比，该系统的稳定性均出色。我们建议竞争机制负责有效的恒定硬度：通过晶格缺陷通过晶格缺陷ni灭的残留应力松弛，通过从旋律分解的C-TIN和C-AIN结构域的相干纳米复合结构形成来平衡。该二次变换（年龄）硬化的例子是作为高级表面工程的新途径以及未来一代硬涂层的开发。 （c）2004 Elsevier B.V.保留所有权利。
The mechanical properties and machining performance of Ti1-xAlxN-coated cutting tools have been investigated. Processing by arc evaporation using cathodes with a range of compositions was performed to obtain coatings with compositions x=0, x=0.25, x=0.33, x=0.50, x=0.66 and x=0.74. As-deposited coatings with xless than or equal to0.66 had metastable cubic structures, whereas x=0.74 yielded two-phase coatings consisting of cubic and hexagonal structures. The as-deposited and isothermally annealed coatings were characterised by nanoindentation, scanning electron microscopy (SEM) and X-ray diffraction (XRD). Cutting tests revealing tool wear mechanisms were also performed. Results show that the Al content, x, promotes a (200) preferred crystallographic orientation and has a large influence on the hardness of as-deposited coatings. The high hardness ( similar to 37 GPa) and texture of the as-deposited Ti1-xAlxN coatings are retained for annealing temperatures up to 950 degreesC, which indicates a superior stability of this system compared to TiN and Ti(C,N) coatings. We propose that competing mechanisms are responsible for the effectively constant hardness: softening by residual stress relaxation through lattice defect annihilation is balanced by hardening from formation of a coherent nanocomposite structure of c-TiN and c-AIN domains by spinodal decomposition. This example of secondary-phase transformation (age-) hardening is proposed as a new route for advanced surface engineering, and for the development of future generation hard coatings. (C) 2004 Elsevier B.V. All rights reserved.