Abstract:Zr N ∕ Ti Al N multilayers with various modulation periods and ratios were grown by ion beam assisted deposition. The nanoscale multilayered modulation was confirmed by Auger electron spectroscopy. All multilayers possess higher hardness than the rule-of-mixture value of monolithic coatings. These properties critically depend on both modulation period and ratio. The multilayer with modulation period of 6.5nm and ratio of 2:3 displays the highest hardness (>30GPa) and critical fracture load (53.3mN). The… Show more
“…The interfaces of NbB 2 and Al 2 O 3 act as barriers to the motion of dislocations glide in nanocomposite film when explain the mechanisms of promoted hardness [ 22 ]. Furthermore, the dislocation blocking due to coherency strains for different nanocrystalline grains also makes a contribution to hardness enhancement [ 23 ]. Fig.…”
Nb-B-Al-O nanocomposite films with different power of Al2O3 were successfully deposited on the Si substrate via multi-target magnetron co-sputtering method. The influences of Al2O3’s content on structure and properties of obtained nanocomposite films through controlling Al2O3’s power were investigated. Increasing the power of Al2O3 can influence the bombarding energy and cause the momentum transfer of NbB2. This can lead to the decreasing content of Al2O3. Furthermore, the whole films showed monocrystalline NbB2’s (100) phase, and Al2O3 shaded from amorphous to weak cubic-crystalline when decreasing content of Al2O3. This structure and content changes were proof by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). When NbB2 grains were far from each other in lower power of Al2O3, the whole films showed a typical nanocomposite microstructure with crystalline NbB2 grains embedded in a matrix of an amorphous Al2O3 phase. Continuing increasing the power of Al2O3, the less content of Al2O3 tended to cause crystalline of cubic-Al2O3 between the close distances of different crystalline NbB2 grains. The appearance of cubic-crystallization Al2O3 can help to raise the nanocomposite films’ mechanical properties to some extent. The maximum hardness and elastic modulus were up to 21.60 and 332.78 GPa, which were higher than the NbB2 and amorphous Al2O3 monolithic films. Furthermore, this structure change made the chemistry bond of O atom change from the existence of O-Nb, O-B, and O-Al bonds to single O-Al bond and increased the specific value of Al and O. It also influenced the hardness in higher temperature, which made the hardness variation of different Al2O3 content reduced. These results revealed that it can enhance the films’ oxidation resistance properties and keep the mechanical properties at high temperature. The study highlighted the importance of controlling the Al2O3’s content to prepare well-defined films with high mechanical properties and thermal stability.
“…The interfaces of NbB 2 and Al 2 O 3 act as barriers to the motion of dislocations glide in nanocomposite film when explain the mechanisms of promoted hardness [ 22 ]. Furthermore, the dislocation blocking due to coherency strains for different nanocrystalline grains also makes a contribution to hardness enhancement [ 23 ]. Fig.…”
Nb-B-Al-O nanocomposite films with different power of Al2O3 were successfully deposited on the Si substrate via multi-target magnetron co-sputtering method. The influences of Al2O3’s content on structure and properties of obtained nanocomposite films through controlling Al2O3’s power were investigated. Increasing the power of Al2O3 can influence the bombarding energy and cause the momentum transfer of NbB2. This can lead to the decreasing content of Al2O3. Furthermore, the whole films showed monocrystalline NbB2’s (100) phase, and Al2O3 shaded from amorphous to weak cubic-crystalline when decreasing content of Al2O3. This structure and content changes were proof by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). When NbB2 grains were far from each other in lower power of Al2O3, the whole films showed a typical nanocomposite microstructure with crystalline NbB2 grains embedded in a matrix of an amorphous Al2O3 phase. Continuing increasing the power of Al2O3, the less content of Al2O3 tended to cause crystalline of cubic-Al2O3 between the close distances of different crystalline NbB2 grains. The appearance of cubic-crystallization Al2O3 can help to raise the nanocomposite films’ mechanical properties to some extent. The maximum hardness and elastic modulus were up to 21.60 and 332.78 GPa, which were higher than the NbB2 and amorphous Al2O3 monolithic films. Furthermore, this structure change made the chemistry bond of O atom change from the existence of O-Nb, O-B, and O-Al bonds to single O-Al bond and increased the specific value of Al and O. It also influenced the hardness in higher temperature, which made the hardness variation of different Al2O3 content reduced. These results revealed that it can enhance the films’ oxidation resistance properties and keep the mechanical properties at high temperature. The study highlighted the importance of controlling the Al2O3’s content to prepare well-defined films with high mechanical properties and thermal stability.
“…Furthermore, multilayer architecture not only combines the advantages of different sublayers − but also possesses the interfacial strengthening effect due to the dislocation blocking, strain effect, and Hall–Petch strengthening. , Multilayer architecture of TiAlN-based coatings has also been proven to improve the comprehensive properties. Such as the TiAlN/MeN (Me = Zr, Ti, and Cr − ) multilayers, whose mechanical and thermal properties can enhance the lifespan of cutting tools. Particularly, multilayer architecture with coherent interfaces releases excessive stress during the growth of TiAlSiN coatings and improves their weak adhesion to the substrate, which prevents the coating from spalling .…”
Recently, the TiAlSiN/TiAlN coatings with excellent mechanical and thermal properties have great potential for protective applications that face deteriorated service environments. Here, we systematically investigate the interface structure, mechanical properties, and thermal stability of TiAlSiN/TiAlN multilayers with varied Al and Si contents of TiAlSiN sublayer. B o t h T i 0 . 5 3 A l 0 . 3 8 S i 0 . 0 9 N / T i 0 . 5 2 A l 0 . 4 8 N ( M L _ 1 ) a n d Ti 0.48 Al 0.38 Si 0.14 N/Ti 0.52 Al 0.48 N (ML_2) exhibit the face-centered cubic structure through epitaxial growth, whereas the Ti 0.43 Al 0.48 Si 0.09 N/Ti 0.52 Al 0.48 N (ML_3) shows a mixed cubic/ wurtzite (c/w) structure. This mechanism is explored by first-principles calculations that the increased content of Al and Si within the TiAlSiN sublayer is detrimental to the formation of a coherent interface. Meanwhile, the change of interfacial structure leads to a variation in hardness from ∼35.6 GPa of ML_1 to ∼35.4 GPa of ML_2 and then to ∼30.9 GPa of ML_3. In addition, ML_1 presents a delayed thermal decomposition by ∼100 °C, compared to those of ML_2 and ML_3 multilayers.
“…In our previous works [15][16][17], we synthesized ZrN or ZrB 2 -based multilayers and revealed superior mechanical properties. In this work, TiB 2 /Si 3 N 4 nano multilayers were synthesized by ion beam assisted deposition (IBAD) system in order to overcome these problems above.…”
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