Ageing behavior of extruded Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt.%) alloy containing LPSO phase and γ' precipitates.
Ageing behavior of extruded Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt.%) alloy containing LPSO phase and γ' precipitates.
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时效%20行为%20of%20挤压%20Mg—8.2Gd—3.8Y—1.0Zn—0.4Zr%20(wt.%)%20合金%20含%20LPSO%20相%20和%20γ%20—析出物
DOI：
10.1038/srep43391
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发表时间：
2017-02-23
影响因子：
4.6
通讯作者：
Kamado S
中科院分区：
文献类型：
--
作者：
Xu C;Nakata T;Qiao XG;Zheng MY;Wu K;Kamado S
研究了长周期堆垛有序（LPSO）相和γ′相对挤压态Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr（wt.%）合金时效行为和力学性能的影响。合金进行了研究。结果表明，含LPSO相的合金在时效过程中析出较多的β′相，因而具有比含γ′相的合金更高的时效硬化响应。β′相的析出强化对含LPSO合金的强度贡献最大。由于致密的纳米级γ′相比LPSO相更有效地诱导强化，以及较大的未再结晶晶粒体积分数和较强的基面织构，含γ′相的合金具有更高的强度。经T5峰时效处理后，含有γ′相的挤压合金具有462 MPa的超高屈服强度和520 MPa的高抗拉强度，以及10.6%的优良上级延伸率。
The effect of long period stacking ordered (LPSO) phase and γ′ precipitates on the ageing behavior and mechanical properties of the extruded Mg–8.2Gd–3.8Y–1.0Zn–0.4Zr (wt.%) alloy was investigated. The results show that more β′ phases precipitate during ageing treatment in the LPSO phase containing alloy so that the LPSO phase containing alloy exhibits a higher age-hardening response than the γ′ precipitates containing alloy. The precipitation strengthening induced by β′ precipitates is the greatest contributor to the strength of the peak-aged LPSO-containing alloys. Higher strength is achieved in γ′ precipitates containing alloy due to the more effective strengthening induced by dense nanoscale γ′ precipitates than LPSO phases as well as the higher volume fraction of coarse unrecrystallized grains with strong basal texture. The extruded alloy containing γ′ precipitates after T5 peak-ageing treatment shows ultra-high tensile yield strength of 462 MPa, high ultimate tensile strength of 520 MPa, and superior elongation to failure of 10.6%.