Fabricating high performance tungsten alloys through zirconium micro-alloying and nano-sized yttria dispersion strengthening
Fabricating high performance tungsten alloys through zirconium micro-alloying and nano-sized yttria dispersion strengthening
复制标题
通过锆微合金化和纳米氧化钇弥散强化制备高性能钨合金
DOI：
10.1016/j.jnucmat.2014.03.029
复制
发表时间：
2014-08-01
影响因子：
3.1
通讯作者：
Liu, C. S.
中科院分区：
文献类型：
--
作者：
Liu, R.;Xie, Z. M.;Liu, C. S.
采用放电等离子烧结法制备了相对密度在97%以上的纯W、W-0.2wt%Zr（WZ）和W-0.2wt%Zr-1.0wt%Y2O3（WZY）。拉伸试验表明，WZ和WZY合金的DBTT在400~500℃之间，比纯W低约200℃。WZY合金在700℃时的极限拉伸强度为534 MPa，分别比WZ合金（295 MPa）和纯W（337 MPa）高81%和58%。 WZY合金的晶粒尺寸约为3.2μm，小于WZ合金和纯W的晶粒尺寸。此外，WZY合金的室温断裂强度和硬度高于纯W。WZY合金力学性能的改善源于Zr微合金化和纳米氧化钇弥散强化增强的晶界凝聚力。 (C) 2014 Elsevier B.V. 保留所有权利。
Pure W, W-0.2wt%Zr (WZ), and W-0.2wt%Zr-1.0wt%Y2O3 (WZY) with a relative density of above 97% were fabricated by spark-plasma-sintering method. The tensile tests indicated that the WZ and WZY alloys exhibited a DBTT between 400 and 500 degrees C, about 200 degrees C lower than pure W. The ultimate tensile strength of WZY alloy at 700 degrees C is 534 MPa, which is 81% and 58% higher than those of WZ alloy (295 MPa) and pure W (337 MPa), respectively. The grain size of WZY alloy is about 3.2 mu m, smaller than that of WZ alloy and pure W. Besides, at room temperature the fracture strength and hardness of the WZY alloy is higher than that of pure W. The improved mechanical property of the WZY alloy was suggested to be originated from the enhanced grain boundaries cohesion by Zr micro-alloying and nano-sized yttria dispersion strengthening. (C) 2014 Elsevier B.V. All rights reserved.