Metal|glass Interface Characterisation Of A Multiscale Bioactive Surface Structure On Ti-6Al-4V Alloy With Laser DED Process
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The present study demonstrates the feasibility to fabricate a multiscale bioactive surface structure onto a biomedical grade Ti-6Al-4V alloy substrate using a multi-material blown powder laser Direct Energy Deposition process (DED). The multiscale surface structure consisted of two layers: a Ti-6Al-4V transition layer with a customised structure, deposited onto a Ti-6Al-4V alloy substrate, followed by a layer of customised bioactive glass cladded on top. It is possible to create a transition layer with physical interlocking features that are fully bonded with the bioactive glass for enhancement of the metal-glass adhesion. The metal|glass interface was characterised in terms of metallurgical reactions and mechanical properties. Indentation tests confirmed excellent cohesion of the metal-glass interface. The microhardness of the bioactive glass near the interface varied from 5.44 to 7.78 GPa. Fracture toughness of the cladded glass was estimated in the range of 1.40-3.91 MPa m1|2.Keywords:
Interface (matter)
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By using OM and XRD analysis,hardness,strength and corrosion potential measurement,the influence of Si,Ca on the microstructure and properties of Mg-2Mn alloy was studied.The results show that the microstructure of Mg-2Mn-0.8Si-0.3Ca and Mg-2Mn-1.5Si-0.3Ca alloy both includs α-Mg,β-Mn and Mg2Si particles.Mg2Si appears as tinny particles in lower Si alloy.The grains of the higher Si alloy are smaller than that of the lower Si alloy.The quantity of the Mg2Si is more and appear as blocks in the higher Si alloy.The Mg2Si does not appear as Chinese character in both alloys.Those alloys are both comprised of α-Mg,Mg2Si and Mn phase,MnSi phase does not appear.The hardness,strength and corrosion resistance of the higher Si alloy is better than that of the lower Si alloy.
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6063 aluminium alloy
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A356 alloy was refined with a new master alloy of Al-5Ti-B-10Sr. The microstructure and mechanical properties of the refined A356 alloy with different content of master alloy (0, 0.1, 0.3, 0.5 and 0.7 wt.%) were investigated. The results show that the refining effect becomes stronger as the master alloy content increasing from 0.1 to 0.3 wt.%, and then shows slight decrement until 0.7 wt.%. An optimal combination of the tensile strength (193 MPa) and the elongation (17.8%) of as-cast A356 alloy was achieved with 0.3 wt.% of refining master alloy. Compared to the non-modified A356 alloy, the tensile strength and the elongation were improved by 10% and 242%, respectively.
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By analyzing the action of rare earth and zinc in AlMgSiCu alloy, it is found that the increasing of zinc can lead the content of Al in the alloy to decrease, to reduce the tendency to form Al-Cu compound, and increase the copper-rich phase of CuZn2, so that the tensile strength and hardness of the alloy improve. It is confirmed that the refinement of RE in high zinc aluminum alloy exist, but the acicular RE compounds appear in the alloy if adding excessive RE in high zinc aluminum alloy, it is bad for the alloy. When adding 0.2% Re and 7.5% Zn to the alloy, there are no obvious needle RE phase in the alloy, which is best for the comprehensive performance of alloy, the tensile strength of 343.14 MPa and hardness of 112.3 HB,the first alloy increased by 10.2% and 2.7% compared with 1# alloy, only the elongation decreases by 17.5%.
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Elongation
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6063 aluminium alloy
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Ternary alloy
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Morphology
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