热等静压成形Ti-45Al-7Nb-0.3W合金热轧板材的超塑性变形行为

doi:10.19976/j.cnki.43-1448/TF.2022044

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Abstract The hot isostatic pressed (HIP) Ti-45Al-7Nb-0.3W alloy sheet prepared by hot-rolled at 1 270 ℃, and the microstructure of the alloy sheet was investigated by scanning electron microscopy (SEM). High-temperature tensile experiments at 950 ℃ with an initial strain rate of 1×10^-4 s^-1 were performed. According to the tensile stress-strain curve and tensile properties, as well as the microstructure evolution and tensile fracture morphology after tensile fracture, the superplastic deformation (SPF) behavior of the alloy sheet with rolling deformation was studied. The results show that after rolling, the microstructure of as-HIPed alloy sheet changes from near-γ microstructure to duplex microstructure. And the average grain size of the sheet decreases and the elongation increases with the increase of rolling reductions. When the rolling reduction is 61%, the average grain size of the hot-rolled sheet is the smallest (9.8 μm), the elongation of the sheet is the largest (367.5%), and the tensile strength is 131 MPa. Continue to increase the rolling deformation, the grain size of the sheet grows, and the elongation decreases. During the SPF, the α₂/γ lamellar colonies rotate and decompose, and a large number of dynamically recrystallized (DRX) grains are generated around them. The superplastic mechanism of the plates is grain boundary slip (GBS) and DRX.

Key words： TiAl-based alloys superplastic pack-rolling microstructure mechanical property

Received: 05 April 2022 Published: 14 September 2022

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TG146.2

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	Articles by authors
	PENG Yuqin
	LI Yingxin
	LIANG Xiaopeng
	LI Huizhong
	CHE Yixuan
	GUO Xinming

Cite this article:

PENG Yuqin,LI Yingxin,LIANG Xiaopeng, et al. Superplastic deformation behavior of hot isostatic pressed Ti-45Al-7Nb-0.3W hot-rolled alloy sheet[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(4): 419-425.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022044 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I4/419

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