β钛合金的强韧化机制分析  

Strength and Fracture Toughness of Beta-Titanium Alloys

作　　者：付艳艳[1] 宋月清[1] 惠松骁[1] 米绪军[1] 叶文君[1] 于洋[1] 

机构地区：[1]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088

出　　处：《稀有金属》2009年第1期92-95,共4页Chinese Journal of Rare Metals

摘　　要：β钛合金的合金成分、热处理工艺和显微组织决定了合金的强韧性。β钛合金的β稳定元素和中型元素Zr可以提高合金的强度,降低断裂韧性。细小的β晶粒不能有效提高时效态β钛合金的强度,可以降低Ti-15-3合金的断裂韧性,对β-C和Ti-1023合金的断裂韧性无明显影响。时效态β钛合金的强度主要取决于时效析出的次生α相的含量和尺寸,在含有同样初生α相的情况下,细小的次生α相可以显著提高合金的强度。初生α相的粗化以及初生相从球状转变为片状会导致β钛合金塑性降低,断裂韧性提高。β钛合金的双态组织具有良好的强度、塑性和韧性的匹配。The strength and fracture toughness of β titanium alloy is controlled by the components, heat treatments and microstrueture. β stable elements and neutral elements can improve the strength of β titanium alloy while reduce the fracture toughness. Small β grain can hardly increase the strength of aged β titanium alloy and fracture toughness of β-C and Ti-1023 alloy, however, it may decrease fracture toughness of Ti-15-3 alloy. The strength of aged β titanium alloy depends on the volume and size of second 15 phase precipitating in aging treatment. Under the same condition of primary β phase, small second β phase can rise strength effectively. The decreasing of plasticity and increasing of fracture toughness are caused by coarse and plate-shape primary β phase. Strength, plasScity and toughness are in good balance as a result of the bi-modal structure of β titanium alloy.

关 键 词：Β钛合金 强度 断裂韧性 显微组织 热处理 

分 类 号：TG146.23[一般工业技术—材料科学与工程]