Correlation of microstructure and mechanical properties of Ti2AlNb manufactured by SLM and heat treatment

Yang, Xiuxuan1; Zhang, Bi2; Bai, Qian1; Xie, Guoyin3

2021-12-01

10.1016/j.intermet.2021.107367

INTERMETALLICS   影响因子和分区

0966-9795

1879-0216

Ti2AlNb intermetallic has a promising application in aeronautics and aerospace industries due to its high strength-to-weight ratio and high creep resistance at an elevated temperature. Selective laser melting (SLM) of this material has been emerging recently. The correlation of its microstructure and mechanical properties after the SLM and heat treatment determines the application of this material. In this paper, the process window of SLM for Ti2AlNb was determined. Characteristics of lath, acicular and grain boundary (GB) precipitates were studied after different heat treatments. The relation of solution heat treatment (SHT) temperature on the size and volume fraction of precipitates before and after aging treatment (AT) were established. High-temperature tensile test of the SLMed and heat-treated intermetallic were conducted. A relation between microstructure and mechanical properties was proposed. The change of the tensile strength and elongation at elevated temperature were rationalized. The results show that for the SLMed sample the dominating B2 phase led to a good mom temperature ductility, but at 650 degrees C the continuous precipitation along the GB deteriorated the tensile strength and ductility. After SHT (920 degrees C) + AT, the maximum elongation (El) at 650 degrees C was significantly increased due to the precipitation of large-sized lath O+alpha(2) phase. After SHT (1000 degrees C) + AT, the maximum ultimate tensile strength (UTS) of the tensile test at 650 degrees C increased to 820 MPa due to the precipitated acicular O phase.

Selective laser melting Ti2AlNb intermetallic Heat treatment Microstructural characteristic High-temperature tensile properties

SCI ; EI

英语

其他

National Natural Science Foundation of China, China[52175381,51605077] ; Peacock Program of Shenzhen, China[KQJSCX20180322152221965]

Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering

Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000706186600003

ELSEVIER SCI LTD

20213810910143

Aerospace industry ; Aluminum alloys ; Ductility ; Grain boundaries ; Heat resistance ; Heat treatment ; Intermetallics ; Melting ; Microstructure ; Niobium alloys ; Selective laser melting ; Tensile strength ; Tensile testing ; Ternary alloys

Metallurgy:531.1 ; Heat Treatment Processes:537.1 ; Aluminum Alloys:541.2 ; Titanium and Alloys:542.3 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Reproduction, Copying:745.2 ; Chemical Operations:802.3 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Dalian Univ Technol, Key Lab Precis & Non Tradit Machining Technol, Minist Educ, Dalian 116024, Peoples R China
2.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China
3.AECC Xian Aeroengine Ltd, Xian 710021, Peoples R China

Yang, Xiuxuan,Zhang, Bi,Bai, Qian,et al. Correlation of microstructure and mechanical properties of Ti2AlNb manufactured by SLM and heat treatment[J]. INTERMETALLICS,2021,139.

Yang, Xiuxuan,Zhang, Bi,Bai, Qian,&Xie, Guoyin.(2021).Correlation of microstructure and mechanical properties of Ti2AlNb manufactured by SLM and heat treatment.INTERMETALLICS,139.

Yang, Xiuxuan,et al."Correlation of microstructure and mechanical properties of Ti2AlNb manufactured by SLM and heat treatment".INTERMETALLICS 139(2021).