Design of a new Al-Cu alloy manipulated by in-situ nanocrystals with superior high temperature tensile properties and its constitutive equation
Design of a new Al-Cu alloy manipulated by in-situ nanocrystals with superior high temperature tensile properties and its constitutive equation
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DOI：
10.1016/j.matdes.2019.107945
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发表时间：
2019-11
影响因子：
8.4
通讯作者：
Linye Zhu;Tian-shu Liu;Tao Duan;Tao Li;F. Qiu;Hong-Yu Yang;Z. Bai;Yingying Liu;Q. Jiang-Q.-Ji
中科院分区：
文献类型：
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作者：
Linye Zhu;Tian-shu Liu;Tao Duan;Tao Li;F. Qiu;Hong-Yu Yang;Z. Bai;Yingying Liu;Q. Jiang-Q.-Ji
本文采用铸造法制备了Ni-Nb-Ti非晶态合金中原位生成的纳米颗粒孕育的AlSingle Band-Cu合金。不同成分的Ni-Nb-Ti非晶态合金显著促进了α-Al的异质形核，并促进了AlSingle Band-Cu合金的明显细化。结果表明，添加0.05wt% 的Ni-Nb-Ti非晶态合金对α-Al(从200 μm细化到39 μm)和θ‘相(从146.4 nm细化到37.6 nm)有显著的细化作用。在高温下，孕育合金的强度和塑性显著提高。在10 1s−1应变速率下，0.0 5−wt%Ni-Nb-Ti非晶态合金在5 33−K下孕育2 0 min，合金的抗拉强度和断裂应变分别比未孕育合金提高32.6 3%和90.35%。纳米NiTi颗粒对α-Al合金的细化起到了一定的作用，在热处理过程中细化了溶质原子扩散距离，细化了θ‘相，从而提高了合金的高温强度和塑性。结果表明，该模型能有效地预测453 K-533 K下10−4s−1~10−1s−1应变率下的应力。
Alsingle bondCu alloys inoculated by in-situ nano-sized particles crystallized from Ni-Nb-Ti amorphous alloys were prepared by casting method in this work. Different compositions of Ni-Nb-Ti amorphous alloys significantly enhanced heterogeneous nucleation for α-Al and promoted obvious grain refinement of the Alsingle bondCu alloys. It was found that 0.05 wt% Ni-Nb-Ti amorphous alloys addition caused a significant and efficient refinement on α-Al (from 200 μm to 39 μm) and θ′ phase (from 146.4 nm to 37.6 nm). The strength and ductility of the inoculated alloy were improved significantly at high temperature. The tensile strength and fracture strain of the alloy inoculated by 0.05 wt% Ni-Nb-Ti amorphous alloy for 20 min at 533 K under the strain rates of 10−1s−1were increased by 32.63% and 90.35% respectively, compared to those of the uninoculated alloy. The nano-sized NiTi particles contributed to the grain refinement of α-Al, and grain refinement shortened the solute atomic diffusion distance and refined θ′ phase during heat treatment, resulting in higher strength and plasticity at high temperature. The model developed for this new type Alsingle bondCu alloy is found to be efficient in predicting the stress at 453 K–533 K under the strain rates of 10−4s−1to 10−1s−1.