首页|Achieving a high strength and tensile ductility synergy of a high-oxygen powder metallurgy near alpha titanium alloy by importing beta t domains into lamellar structures
Achieving a high strength and tensile ductility synergy of a high-oxygen powder metallurgy near alpha titanium alloy by importing beta t domains into lamellar structures
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NSTL
Elsevier
A near alpha titanium alloy Ti-3Al-2Zr-2Mo (wt%) was prepared by vacuum sintering of TiH2-based powder compact and multiple directional hot forging. beta-transformed (beta(t)) domains were imported into lamellar structures in order to break the strength-ductility trade-off dilemma of high-oxygen PM titanium alloys. It was revealed that beta(t) domains were harder than alpha laths in bi-lamellar microstructure prepared by annealing at 880 degrees C, and the alpha/beta(t) interfaces contributed to activation of abundant basal and non-basal slip systems in a laths, which brought about strong strain hardening and resulted in simultaneously enhanced strength and ductility. The bi-lamellar microstructure renders a high ultimate tensile strength (UTS) of 881 MPa and an elongation-to-fracture (EI) of 15.0%. By contrast, basket-weave microstructure produced via annealing at 950 degrees C exhibited the highest UTS up to 975 MPa, mainly because that its predominant alpha laths become inversely harder than adjacent beta(t) domains. Correspondingly, strain hardening got much weakened, stress concentration at colony boundaries led to a premature fracture and a low ductility. A new insight of beta(t) domains and their effect on mechanical properties of PM near alpha titanium alloy is proposed. (C) 2021 Elsevier B.V. All rights reserved.
NSTL
Elsevier
