激光熔化沉積TA15+Ti2AlNb合金的組織與力學(xué)性能

激光熔化沉積TA15+Ti2AlNb合金的組織與力學(xué)性能Microstructure and Mechanical Properties of Laser Melting Deposited TA15+Ti2AlNb Alloys

將TA15和Ti2AlNb合金粉末以不同比例預(yù)混，采用激光熔化沉積工藝，制備出40%TA15+60%Ti2AlNb，50%TA15+50%Ti2AlNb，60%TA15+40%Ti2AlNb （質(zhì)量分?jǐn)?shù)）3種比例的合金薄壁，分析了薄壁的成分、組織及力學(xué)性能。結(jié)果表明：3種沉積薄壁的成分分布均勻，合金由α相、α2相及β/B2相組成，針狀α相和α2相呈網(wǎng)籃狀分布在初生β/B2晶粒內(nèi)部；3種合金的抗拉強(qiáng)度分別為1108 MPa，1071 MPa，1105 MPa，斷裂伸長(zhǎng)率分別為3.0%，2.2%，3.8%；拉伸斷口可見沿α2相撕裂產(chǎn)生的撕裂棱，斷裂方式均為準(zhǔn)解理斷裂。

Three different proportions of TA15 and Ti2AlNb alloy powde were premixed and thin-walls with proportions of 40%TA15+60%Ti2AlNb, 50%TA15 +50% Ti2AlNb and 60%TA15+40%Ti2AlNb (mass fraction) were prepared by using laser melting deposition process. The composition, microstructure and mechanical properties of the three thin-walls were analyzed. The results indicate that the compositions of all the three kinds of alloys are uniform. The alloy appears as basketweave microstructure with acicular α phase and α2 phase distributing within primary β/B2 grain. Tensile strength of the three kinds of alloys are 1108 MPa and 1071 MPa, 1105 MPa, and elongation are 3.0%, 2.2% and 3.8% respectively; Tear ridge along α2 phases is visible on tensile fracture surface, and the fracture mode is subject to cleavage fracture.

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