(1. 四川大學(xué) 材料科學(xué)與工程學(xué)院， 成都 610065；
2. 中國(guó)核動(dòng)力研究設(shè)計(jì)院 核燃料及材料國(guó)家重點(diǎn)實(shí)驗(yàn)室，
成都 610041；
3. 成都飛機(jī)工業(yè)有限責(zé)任公司， 成都 610091)
摘 要: 研究了含氫量為11%(質(zhì)量分?jǐn)?shù))的一種Ti-Al-Zr合金在室溫和100℃時(shí)的氫致延遲斷裂行為。結(jié)果表明該合金的裂紋擴(kuò)展分兩個(gè)階段：在第1階段中，裂紋擴(kuò)展速率da/dt隨著應(yīng)力強(qiáng)度因子KⅠ的增加而稍稍增加(室溫下)或者不變(100℃時(shí))；在第2階段da/dt隨KⅠ增加而迅速增加，當(dāng)KⅠ達(dá)到KⅠH時(shí)，試樣失穩(wěn)斷裂。室溫和100℃時(shí)的KⅠH分別為58MPa/m3/2和61MPa/m3/2。
關(guān)鍵字: Ti-Al-Zr合金；氫致延遲斷裂；力學(xué)性能
behavior of Ti-Al-Zr alloy
JIANG You-rong2 ，HE Xiao3
（1. School of Materials Science and Engineering,
Sichuang University, Chengdu 610065, China;
2. State Key Laboratory of Nuclear Flue and Materials,
Nuclear Power Institute of China, Chengdu 610041, China;
3. Chengdu Aerocraft Company, Chengdu 610091, China）
Abstract:Hydrogen induced delayed fracture behavior of a Ti-Al-Zr alloy containing 11%(mass fraction) hydrogen at room temperature and 100℃ was studied. The results show that the curves of crack propagation velocityvs stress intensity factor have typical two-stage characteristics. In the first stage, crack growth velocity(da/dt) does not increase significantly with stress intensity factor KⅠ. But in the second stage，(da/dt) increase rapidly with KⅠ increasing，and the specimen fractures when KⅠ extends to critical value KⅠH. KⅠH at room temperature and 100℃ is about 58MPa/m3/2 and 61MPa/m3/2 respectively.
Key words: Ti-Al-Zr alloy; hydrogen induced delayed fracture; mechanical property
