Yttrium for the selective laser melting of Ti-45Al-8Nb intermetallic: Powder surface structure, laser absorptivity, and printability

Li，W. P.1,2,3; Wang，H.2; Zhou，Y. H.2,3; Zhu，Y. Y.2; Lin，S. F.3; Yan，M.3; Wang，N.1

2022-02-05

10.1016/j.jallcom.2021.161970

JOURNAL OF ALLOYS AND COMPOUNDS   影响因子和分区

0925-8388

High Nb-TiAl alloys are important materials to realize critical, light-weight parts of high-temperature applications. It has been challenging, however, to realize their laser-based additive manufacturing (AM) due to the materials’ high crack sensitivity. To mitigate the cracking problem particularly relating to oxygen, this study is designed to investigate the impact of introduced rare earth element (Y) on the microstructure, surface chemistry, and laser absorptivity of gas-atomized Ti-45Al-8Nb powder, and consequently on the printability of the alloy regarding its selective laser melting (SLM). It is observed that the Y addition significantly improves the SLM printability of the alloy and realizes samples that are free of macrocracks. The change in the surface structure of the powder is regarded as a critical factor contributing to improved printability. The corresponding chemical state and layer thickness of the oxide film covering the powder are determined by X-ray photoelectron spectroscopy (XPS) depth profile and transmission electron microscopy (TEM). It is further found that the surface structure of the powder leads to a higher laser absorption. As suggested by the study, modification of powder chemistry and powder surface structure by rare earth elements can be an effective means to improve the SLM formability of crack-sensitive materials.

Additive manufacturing High Nb-containing TiAl intermetallic Powder modification Selective laser melting

SCI ; EI

英语

其他

20214010972489

Additives ; Aluminum alloys ; Binary alloys ; High resolution transmission electron microscopy ; High temperature applications ; Intermetallics ; Melting ; Niobium alloys ; Oxide films ; Selective laser melting ; Surface structure ; Ternary alloys ; Titanium alloys ; X ray photoelectron spectroscopy

Metallurgy:531.1 ; Aluminum Alloys:541.2 ; Titanium and Alloys:542.3 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Optical Devices and Systems:741.3 ; Reproduction, Copying:745.2 ; Chemical Operations:802.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Inorganic Compounds:804.2 ; Physical Properties of Gases, Liquids and Solids:931.2

MATERIALS SCIENCE

2-s2.0-85116036224

Scopus

1.College of New Materials and New Energies,Shenzhen Technology University,Shenzhen,518118,China
2.Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering,College of Mechatronics and Control Engineering,Shenzhen University,Shenzhen,518060,China
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Li，W. P.,Wang，H.,Zhou，Y. H.,et al. Yttrium for the selective laser melting of Ti-45Al-8Nb intermetallic: Powder surface structure, laser absorptivity, and printability[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2022,892.

Li，W. P..,Wang，H..,Zhou，Y. H..,Zhu，Y. Y..,Lin，S. F..,...&Wang，N..(2022).Yttrium for the selective laser melting of Ti-45Al-8Nb intermetallic: Powder surface structure, laser absorptivity, and printability.JOURNAL OF ALLOYS AND COMPOUNDS,892.

Li，W. P.,et al."Yttrium for the selective laser melting of Ti-45Al-8Nb intermetallic: Powder surface structure, laser absorptivity, and printability".JOURNAL OF ALLOYS AND COMPOUNDS 892(2022).