(1. 大連理工大學(xué) 三束材料改性教育部重點實驗室&材料科學(xué)與工程學(xué)院，大連 116024；
2. 中國核動力研究設(shè)計院 反應(yīng)堆燃料及材料重點實驗室，成都 610213)
摘 要: 利用“團(tuán)簇加連接原子”結(jié)構(gòu)模型解析典型高溫近α-Ti合金Ti 1100成分，進(jìn)而在此基礎(chǔ)上添加Hf、Ta和Nb元素進(jìn)行合金化，形成成分通式 [Al-(Ti13.7(Zr/Hf)0.3)](Al0.69Sn0.18Si0.12(Mo/Ta/Nb)0.03)。合金組織結(jié)構(gòu)分析和高溫抗氧化性結(jié)果表明：Hf元素的添加并未改變合金的結(jié)構(gòu)和組織，在此基礎(chǔ)上，不同配比的Ta和Nb替代Mo時合金由片層轉(zhuǎn)變β組織轉(zhuǎn)變?yōu)榈容Sα組織；系列合金在800 ℃下，Hf替代Zr后合金的抗氧化能力顯著提高，Ta和Nb進(jìn)一步合金化后合金的抗氧化能力進(jìn)一步增強，其100 h后的氧化質(zhì)量增加約為(2.2±0.2) mg/cm2。
關(guān)鍵字: 近α-Ti合金；成分設(shè)計；微量合金化；高溫氧化
（1. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education,
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China;
2. Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China,
Chengdu 610213, China）
Abstract:The composition characteristics of near α-Ti alloy Ti 1100 with the guidance of a cluster-plus-glue-atom model were investigated. A new alloy series with the cluster formula of [Al-(Ti13.7(Zr/Hf)0.3)](Al0.69Sn0.18Si0.12- (Mo/Ta/Nb)0.03) was designed by adding minor Hf, Ta, and Nb. The structures of alloys were characterized, and the oxidation resistance properties were measured. The results show that the Hf substitution for Zr doesn’t influence the β transition lamellar microstructure. While that various combinations of Ta and Nb to substitute for Mo could form equiaxed α microstructure. The oxidation-resistant capacities of designed alloys are enhanced obviously at 800 ℃ in comparison with that of Ti 1100. The oxidation mass gains of the designed alloys with Hf, Nb and Ta co-alloying after 100 h at 800 ℃ are about (2.2±0.2) mg/cm2.
Key words: near α-Ti alloys; composition design; minor alloying; high-temperature oxidation
