Growth rates dependence of macro/microstructures and mechanical properties of Ti-47Al-2Nb-2Cr-0.2Er alloy directionally solidified by cold crucible

Growth rates dependence of macro/microstructures and mechanical properties of Ti-47Al-2Nb-2Cr-0.2Er alloy directionally solidified by cold crucible
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冷坩埚定向凝固Ti-47Al-2Nb-2Cr-0.2Er合金宏观/微观组织和力学性能对生长速率的依赖性

DOI:
10.1016/j.matdes.2017.04.013
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发表时间:
2017-07
期刊:
影响因子:
8.4
通讯作者:
Hengzhi Fu
Hengzhi Fu
中科院分区:
材料科学1区
文献类型:
--
作者:
Qiang Wang;Hongsheng Ding;Hailong Zhang;Shiqiu Liu;Ruirun Chen;Jingjie Guo;Hengzhi Fu

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采用功率为50 kW的冷坩埚定向凝固方法,以0.6 ~ 1.2 mm/min的生长速率制备了si - 47al - 2nb - 2cr -0.2 er金属间合金。详细研究了定向凝固铸锭的宏观组织演变和力学性能。从铸锭中心到铸锭边缘,柱状晶粒与生长方向的夹角逐渐增大。当生长速率为0.6 ~ 1.0 mm/min时,片层取向无明显变化,而当生长速率为1.2 mm/min时,片层取向明显偏离生长方向。层间间距与生长速率成反比。层间间距越小,合金的纳米压痕硬度越高。纳米压痕硬度(HN)与层间间距(λ)的对应关系可拟合为:HN= 36.3λ−0.254。半共格界面阻碍了位错的移动,提高了合金的抗拉强度,拉伸伸长率的提高可归因于变形均匀性的改善。
IntermetallicsTi-47Al-2Nb-2Cr-0.2Er alloys are prepared at different growth rates ranging from 0.6 mm/min to 1.2 mm/min via cold crucible directional solidification with the power of 50 kW. The macro/microstructure evolutions and mechanical properties of the directionally solidified ingots are studied in details. The angles between the columnar grains and the growth direction increase gradually from the center to the edge of the ingot. The lamellae orientations show no distinct variations under the growth rates of 0.6–1.0 mm/min, while the lamellae orientation deviates significantly from the growth direction at the growth rate of 1.2 mm/min. The interlamellar spacing is inverse proportional to the growth rate. The alloy with finer interlamellar spacing shows higher nanoindentation hardness. The corresponding relationship between nanoindentation hardness (HN) and interlamellar spacing (λ) can be fitted byHN= 36.3λ− 0.254. Hindrance of the semi-coherent interface to dislocation movement results in higher tensile strength of the alloy and the larger tensile elongation can be attributed to the improvement of the deformation uniformity.
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