Release Time:2022-07-05  Hits:

Indexed by: Journal Article

Date of Publication: 2022-06-30

Journal: 稀有金属材料与工程

Volume: 47

Issue: 05

Page Number: 1471-1477

ISSN: 1002-185X

Abstract: The composition rule of near-a Ti alloy Ti1100 was investigated using a cluster-plus-glue-atom model f similar to or solid-solution alloys, and its cluster formula could be expressed as [Al-(Ti13.7Zr0.3)](Al(0.69)Sno(0.18)Mo(0.03)Si(0.12)). A new series of alloys by adding minor Hf, Ta and Nb with similar elements substitution in equimolar ratio were then designed, being [Al-(Ti-13,7Zr0.15Hf0.15)](Al0.69Sn0.18Si0.1(Mo/Ta/Nb)(0.03))" These alloys were solid-solution-treated at 950 degrees C for 1 h followed by water-quenching, and then aged at 560 degrees C for 6 h. Subsequently, the microstructures, microhardness, elevated temperature oxidation- and corrosion-resistance of the alloys were measured. The results show that the alloy with Hf-0.15 substitution for Zr-0.15 in Ti1100 still exhibits a beta-transformed lamellar microstructure, while the further combinations of Ta and Nb induce a large amount of equiaxed alpha grains to form a duplex microstructure. The change of microstructure hardly affects the microhardness of the alloys, within a range of 3300 similar to 3700 MPa. All the designed alloys, as well as the reference Ti1100, possess excellent oxidation-resistance at 650 degrees C, and all the oxidation mass gains are less than 1.0 mg/cm(2). But the results are obviously different in comparison with that of Ti1100 at 800 degrees C. The oxidation mass gains of the designed alloys with Hf, Ta and Nb co-alloying after 100 h are significantly fewer, and the widths of the dense oxidation layers are among 23 similar to 27 mu m. The [A1-(Ti13.7Zr0.15Hf0.15)](Al0.69Sn0.18Si0.1Ta0.015Nb0.015) alloy has the best oxidation resistance with the fewest oxidation mass gain of 2.6 mg/cm(2). In addition, this series of alloys also have good corrosion resistance in 3.5%NaCI.

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