TY - JOUR
T1 - In situ design of ultrafine-grained 7075 Al alloy with laser powder bed fusion
AU - He, Xi
AU - Li, Gan
AU - Huang, Yuhe
AU - Huang, Zhun
AU - Wang, Tao
AU - Li, Xinggang
AU - Zhu, Qiang
PY - 2023/8/1
Y1 - 2023/8/1
N2 - Laser powder bed fusion (L-PBF) is an advanced fast prototyping method for fabricating high-performance metallic components with complex structures. However, the development of L-PBFed high-strength Al alloys is often limited by the hot cracks. To grapple with this difficult issue, a novel solution was proposed by introducing 3 wt% Ti2AlNb intermetallic (IMC) powders into the 7075 Al powders to form an in-situ nucleated 7075 (IN-7075) Al alloy. The results indicated that the as-printed IN-7075 Al alloy was crack-free, and the grain size has been refined from 72.6 μm to 1.5 μm, which was attributed to the in-situ formation of Al3(Ti, Nb) particles and the high grain growth restriction factor (Q) values of Ti and Nb elements in the Al matrix. After a suitable heat treatment, the IN-7075 Al alloy exhibited good mechanical properties with an ultimate tensile strength of 429 ± 2 MPa and an elongation of 9.8 ± 0.5%. © 2023 Elsevier B.V.
AB - Laser powder bed fusion (L-PBF) is an advanced fast prototyping method for fabricating high-performance metallic components with complex structures. However, the development of L-PBFed high-strength Al alloys is often limited by the hot cracks. To grapple with this difficult issue, a novel solution was proposed by introducing 3 wt% Ti2AlNb intermetallic (IMC) powders into the 7075 Al powders to form an in-situ nucleated 7075 (IN-7075) Al alloy. The results indicated that the as-printed IN-7075 Al alloy was crack-free, and the grain size has been refined from 72.6 μm to 1.5 μm, which was attributed to the in-situ formation of Al3(Ti, Nb) particles and the high grain growth restriction factor (Q) values of Ti and Nb elements in the Al matrix. After a suitable heat treatment, the IN-7075 Al alloy exhibited good mechanical properties with an ultimate tensile strength of 429 ± 2 MPa and an elongation of 9.8 ± 0.5%. © 2023 Elsevier B.V.
KW - 7075 Al alloy
KW - Additive manufacturing
KW - Grain refinement
KW - Laser powder bed fusion
KW - Metals and alloys
KW - Ti2AlNb intermetallic
UR - http://www.scopus.com/inward/record.url?scp=85153508267&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85153508267&origin=recordpage
U2 - 10.1016/j.matlet.2023.134401
DO - 10.1016/j.matlet.2023.134401
M3 - RGC 21 - Publication in refereed journal
SN - 0167-577X
VL - 344
JO - Materials Letters
JF - Materials Letters
M1 - 134401
ER -
