Microstructure and mechanical properties of hot-rolled Zr–3Al–χBe alloys

Microstructure and mechanical properties of hot-rolled Zr–3Al–χBe alloys
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热轧Zr-3Al-Be合金的显微组织与力学性能

DOI:
10.1016/j.msea.2015.06.017
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发表时间:
2015-08
期刊:
Mater. Sci. Eng. A
影响因子:
--
通讯作者:
R.P. Liu
R.P. Liu
中科院分区:
其他
文献类型:
--
作者:
X.Y.Zhang;B.Pan;M.Z.Ma;R.P. Liu

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研究了铍(Be)对Zr-3Al-χBe合金(χ=0,0.4,0.6,0.8wt%)热轧态组织和力学性能的影响。X射线衍射和光学显微镜结果表明,Be的加入使合金中的α相被α相+Be 2 Zr化合物所取代。同时,随着Be含量从0.4wt%增加到0.8wt%,Zr-3Al-xBe合金中Be 2 Zr颗粒的含量增加。此外,热轧态Zr-3Al合金还发生了部分α再结晶。Be的加入使合金的α再结晶程度增加。Be的加入有利于合金拉伸性能的提高。Zr-3Al-0.8Be合金的最大抗拉强度为1103 MPa,比热轧态Zr-3Al合金提高了27%,伸长率保持在6.07%。断口分析结果表明,随着Be含量的增加,Zr-3Al-χBe合金的断裂模式由韧性断裂向韧脆结合型断裂转变。
The effects of beryllium (Be) addition on the microstructure and mechanical properties of hot-rolled Zr–3Al–χBe alloys (χ=0, 0.4, 0.6, and 0.8 wt%) were characterized experimentally. X-ray diffraction and optical microscopic results indicated that the complete α phase was replaced by α phase+Be2Zr compound in the alloys after Be addition. Meanwhile, with an increase of Be content from 0.4 wt% to 0.8 wt%, the content of Be2Zr particles increased in the examined Zr–3Al–χBe alloys. Moreover, partial α recrystallization was observed in the hot-rolled Zr–3Al alloy. The degree of α recrystallization tended to increase in the alloys with Be addition. Adding Be is beneficial to the improvement of the tensile properties. The Zr–3Al–0.8Be alloy exhibited maximum ultimate tensile strength of 1103 MPa, which increased by 27% compared with that of the hot-rolled Zr–3Al alloy and the elongation remained at 6.07%. Fractography results indicated that the fracture modes of the Zr–3Al–χBe alloys transformed from ductile to a combination of ductile and brittle with the gradual addition of Be.
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