Microstructure and Mechanical Properties of In718 Alloy Produced with Twin-Scanning Atomizer
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Sound billets were produced at BIAM with a twin-scanning spray forming facility. Microstructure and mechanical properties of In718 alloy produced with this technology were examined. Both tensile strength and stress rupture properties are excellent with the rupture life even doubled after received a direct aging heat treatment.Keywords:
Spray forming
The Mg–11Li–3Al–xY (LA113–xY, x = 0, 2·0; mass fraction, %) alloys were designed and prepared using a vacuum induction furnace by argon atmosphere, then processed by hot extrusion. The results show that, as yttrium (Y) is added, the LA113–2Y alloy mainly consists of β-Li, LiMgAl2 and Al2Y phases. The fine, granular and dispersed Al2Y phase is favoured for refining matrix crystals and optimising internal microstructure of the alloy. The microstructures of the investigated alloys are crushed into smaller phases, and obviously refined after hot extrusion process. As Y is added, the strength of the alloy also improves by the refining effect and the Al2Y phase. Specifically, the extruded LA113–2Y alloy exhibits a favourable combination of strength and ductility, with yield strength of 227·06 MPa, ultimate tensile strength of 239·65 MPa and elongation of 20·71%.
Ductility (Earth science)
Refining (metallurgy)
Elongation
Vacuum induction melting
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The ZA35 alloy with 3.5% Mn is manufactured with spray forming technique using the optimized parameters. The microstructure and corrosion resistance of casting and spray forming ZA35 alloy are studied. It is indicated that the microstructures of spray formed high Mn ZA35 alloy distribute homogeneous and the grains are refined. The element Mn exists mainly in the form of Mn-enriched independent hard phase in or near the interfaces of grains of casting ZA35 alloy, but the Mn-enriched independent hard phases are not found in spray formed high Mn ZA35 alloy. The solid solubility of Mn in ZA35 matrix is shifted to a higher level by spray forming. The corrosion trend of spray forming alloy with refined grain can be restrained considerably by the treatment of solid and aging.
Spray forming
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Effect of extrusion temperature and extrusion ratio on microstructure and mechanical properties of spray deposited hypereutectic Al-Si alloy is summarized. Mechanical properties of different alloy elements hypereutectic Al-Si alloy are compared. Progress in research on it is reviewed.
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To analysis the microstructure and properties of super-high strength Al-Zn-Mg-Cu alloys containing Zr ,Ni and Mn, the apparatus of SEM、TEM、and Tensile machine was used. The results show that the microstructure was fine and homogeneous, the phases became finer for the alloys with adding Zr, Mn, Ni than the alloy with Zr only after solid solution. The ultimate tensile strength of the alloy was 850MPa and the elongation was 5% respectively at peak aging.
Elongation
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Aluminium alloy materials prepared by rapidly solidification process are expanding applications with their superior properties such as lightness, strength and wear resistance. In this prospective field, spray forming (SF) is now a matter of the special interest because of its simpler process, lower cost and lower oxygen content in products.In this experiment, we prepared three SF preforms of Al-Si alloy sprayed with various "gas to metal (G/M) ratio". The microstructure and mechanical properties of the preforms and extruded materials were investigated, and found to be controled by G/M ratio. The increase of G/14 ratio reduces primary Si size and hence lowers wear resistance. On the contrary, strength of the extruded materials increases with G/M ratio.
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In this study, Cu-10Sn and Cu-10Sn-2Ni-0.2Si alloys have been manufactured by spray casting in order to achieve a fine scale microstructure and high tensile strength, and investigated in terms of microstructural evolution, aging characteristics and tensile properties. Spray cast alloys had a much lower microhardness than continuous cast billet because of an improved homogenization and an extended Sn solid solubility. Spray cast Cu-Sn-Ni-Si alloy was characterized by an equiaxed grain microstructure with a small-sized (Ni, Si)-rich precipitates. Cold rolling of Cu-Sn-Ni-Si alloy increased a tensile strength to 1220 MPa, but subsequent ageing treatment reduced a ultimate tensile strength to 780 MPa with an elongation of 18%.
Equiaxed crystals
Elongation
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Mg-9Al-4.5Ca billets were prepared by spray deposition. Microstructures and mechanical properties of the deposited and extruded billets were studied by means of optical microscop(OM),X-ray diffraction (XRD),scanning electronic microscopy (SEM) and measurement of tensile properties. The results show that the structure of spray deposited Mg-9Al-4.5Ca alloy is much smaller than that of cast alloy, the microstructures are 3-5 μm equiaxed grains in deposited alloy and can be further refined after hot extruding. The phase in deposited billet includes α-Mg、Al2Ca、Mg2Ca、 Mg6Ca2Zn3 and MgZn2,but it transforms to α-Mg、Al2Ca、Mg2Ca、Mg17Al12 and MgZn2 after hot extruding. The strength of spray deposited magnesium alloy is much higher than that of MB7 alloy, the tensile strength,yield strength and elongation is 470 MPa,390 MPa and 8%respectively.Grain size refinement,solution strengthening and dispersion strengthening are the main mechanism.
Spray forming
Equiaxed crystals
6063 aluminium alloy
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Spray forming
Tensile testing
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Elongation
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Al-Li alloy containing high content of Li and its modified alloy with 0.5% Cu are prepared by spray deposited processing,and then extruded and aged. Microstructure and tensile properties at room temperature are determined for the two alloys at different conditions. The results show that spray deposited Al-3.8Li-1.0Mg-0.4Ge-0.2Zr alloy possess a fine equiaxed microstructure and precipitates Al_4Li_9 and δ-AlLi phases. Large amounts of δ′-AlLi phases are formed after aging. The addition of 0.5%Cu to the alloy leads to an improvement of 30～48MPa and 44MPa for yield strength and ultimate tensile strength respectively. The reason of improvement is due to the solid-solution strengthening effect of Cu and the decrease of the solid solubility of Li in the matrix leading to the higher volume fraction of δ′phases.
Equiaxed crystals
Spray forming
Volume fraction
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