TY - JOUR
T1 - Research on laser solid forming of a functionally gradient Ti-Ti2AlNb alloy
AU - Liu, Jiantao
AU - Lin, Xin
AU - Lu, Xiaowei
AU - Chen, Jing
AU - Huang, Weidong
PY - 2008/8
Y1 - 2008/8
N2 - A functionally gradient Ti-Ti2AlNb alloy, which has continuous compositional gradient and regular outline with a length about 17 mm, was fabricated by laser solid forming. Phase morphological evolution and microstructure evolution, and microhardness along the compositional gradient direction were analyzed. With the increase of aluminum and niobium contents, a series of phase evolutions along the compositional gradient occurred: α′→ α+β →α+α′ → α′→ α+β → α+β/B2+α2 → β/B2+α2 →β/B2 → B2+α+O →B2, and the compositionally gradient material accomplished a transition of α titanium alloy, α+β titanium alloy, β titanium alloy, finally Ti2AlNb-based alloy. In the transition layers, the microhardness HV increased from 170 of Ti at the bottom to 470 of Ti2AlNb at the top. Based on the non-equilibrium phase diagram of the Ti-rich corner, the phase morphological evolution during forming were explained with the analysis of the influences of the Al and Nb on the stabilities of α, β and α2 phases in titanium alloys.
AB - A functionally gradient Ti-Ti2AlNb alloy, which has continuous compositional gradient and regular outline with a length about 17 mm, was fabricated by laser solid forming. Phase morphological evolution and microstructure evolution, and microhardness along the compositional gradient direction were analyzed. With the increase of aluminum and niobium contents, a series of phase evolutions along the compositional gradient occurred: α′→ α+β →α+α′ → α′→ α+β → α+β/B2+α2 → β/B2+α2 →β/B2 → B2+α+O →B2, and the compositionally gradient material accomplished a transition of α titanium alloy, α+β titanium alloy, β titanium alloy, finally Ti2AlNb-based alloy. In the transition layers, the microhardness HV increased from 170 of Ti at the bottom to 470 of Ti2AlNb at the top. Based on the non-equilibrium phase diagram of the Ti-rich corner, the phase morphological evolution during forming were explained with the analysis of the influences of the Al and Nb on the stabilities of α, β and α2 phases in titanium alloys.
KW - Functionally gradient material
KW - Hardness
KW - Laser solid forming
KW - Microstructure
KW - Phase transformation
KW - TiAlNb
KW - Titanium
UR - http://www.scopus.com/inward/record.url?scp=51149098561&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:51149098561
SN - 0412-1961
VL - 44
SP - 1006
EP - 1012
JO - Jinshu Xuebao/Acta Metallurgica Sinica
JF - Jinshu Xuebao/Acta Metallurgica Sinica
IS - 8
ER -