摘要
通过粉末冶金和热加工方法制备氧含量为0.42%~0.54%(质量分数)的Ti−Zr合金。结果表明:Ti−Zr合金由具有相同α相结构的富Zr区和贫Zr区组成,富Zr区域的氧含量较高,且晶粒尺寸较小。Ti−Zr合金同时具有高强度(σs=700~900 MPa)和高的总伸长率(>20%),而氧的固溶强化是主要的强化机制。Zr由于与Ti具有高度结构相似性,对氧诱发Ti合金脆化的影响不大。因此,0.54%(质量分数)的高含量值仍处于韧性到脆性转变的临界氧含量范围内,不明显降低材料的延展性。
Ti−Zr alloys(oxygen content 0.42−0.54 wt.%)were prepared via powder metallurgy and hot working.The results indicate that the Ti−Zr alloys exhibit Zr-rich and Zr-lean areas with the sameα-phase structure,and the Zr-rich area shows a slightly higher oxygen content and a much finer grain size.The Ti−Zr alloys present a good combination of high strength(σs=700−900 MPa)and total elongation(>20%),and solid solution strengthening of oxygen plays a major role.Zr does not influence much the oxygen-induced brittleness due to its high structural similarity to Ti.Therefore,the high value of 0.54 wt.%is still within the critical oxygen content for the ductile-to-brittle transition of Ti and does not degrade the ductility.
作者
刘咏
汤菡纯
黄千里
赵大鹏
何俊阳
曹远奎
宋旼
刘彬
欧阳思慧
Yong LIU;Han-chun TANG;Qian-li HUANG;Da-peng ZHAO;Jun-yang HE;Yuan-kui CAO;Min SONG;Bin LIU;Si-hui OUYANG(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;College of Biology,Hunan University,Changsha 410082,China;Max-Planck-Institut für Eisenforschung GmbH,Düsseldorf 40237,Germany)
基金
Project(51625404)supported by the National Natural Science Foundation for Distinguished Young Scholar of China。
