Abstract
Laser additive manufacturing with mixed powders of boron carbide and aluminum alloy is investigated. Parameters such as laser power, scan speed, scan pattern, and hatching space are systematically evaluated and optimized to obtain the desired density and porosity. These results show that the AM part contains 20 wt% boron carbide and 80 wt% aluminum alloy, which are well mixed and synthesized during the melting process. Its mechanical properties are close to those of aluminum. A thin-wall structure based two dimensional and three dimensional radial collimators were fabricated with well-controlled geometry for neutron scattering measurement.
Highlights
Using neutron scattering measurement, materials at the atomic level can be probed, which is essential to develop innovations like faster computers, tougher armor, and effective medicines
Radial collimators are used when a neutron scattering instrument employs a large area of detectors to cover a wide range of scattering angles [1,2]
A radial collimator consists of a series of absorbing septa radially oriented from a fixed point
Summary
Materials at the atomic level can be probed, which is essential to develop innovations like faster computers, tougher armor, and effective medicines. A radial collimator consists of a series of absorbing septa radially oriented from a fixed point These collimators will often oscillate several degrees at the sample position. Direct thin-wall (2D and 3D) fabrication for radial collimators for neutron scattering instrument is still a challenging field [1,2], especially for multimaterials such as a mixture of boron carbide (B4 C) and Al alloy (AlSi10Mg). This is mainly due to a limited understanding of composition control, laser melting control, melted structure formation, and phase transition.
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