期刊
MATERIALS PERFORMANCE AND CHARACTERIZATION
卷 5, 期 5, 页码 701-716出版社
AMER SOC TESTING MATERIALS
DOI: 10.1520/MPC20160037
关键词
Additive manufacturing; selective laser melting; Al10-Si-1Mg; porosity; X-ray computed tomography (XCT); synchrotron
资金
- Commonwealth of Pennsylvania under the auspices of the Research for Additive Manufacturing in Pennsylvania (RAMP) program
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1434462, 1606567, 1435544] Funding Source: National Science Foundation
Aluminum alloys are candidate materials for weight critical applications because of their excellent strength and stiffness to weight ratio. However, defects such as voids decrease the strength and fatigue life of these alloys, which can limit the application of Selective Laser Melting. In this study, the average volume fraction, average size, and size distribution of pores in Al10-Si-1Mg samples built using Selective Laser Melting have been characterized. Synchrotron high energy X-rays were used to perform computed tomography on volumes of order one cubic millimeter with a resolution of approximately 1.5 mu m. Substantial variations in the pore size distributions were found as a function of process conditions. Even under conditions that ensured that all locations were melted at least once, a significant number density was found of pores above 5 mu m in diameter.
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