孪生行为对TA18钛合金管材塑性的影响  

Influence of Twinning Behavior on Plasticity of TA18 Titanium Alloy Tubes

作　　者：刘燕平[1] 张晖[1] 张旺峰[2] 李艳[2] 王玉会[2] 

机构地区：[1]西安交通大学,陕西西安710049 [2]北京航空材料研究院,北京100095

出　　处：《稀有金属材料与工程》2013年第6期1169-1172,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金委员会与中国民用航空局联合资助项目(61179068)

摘　　要：利用电液伺服材料试验机,对直径为Φ16的TA18(Ti-3Al-2.5V)钛合金管材试样分别在–60,25,100,200,300和350℃下进行了静态拉伸试验,并结合TEM观察TA18钛合金管材在高低温下的显微组织。结果表明,TA18钛合金管材的强度和塑性均随温度的升高而降低;通过TEM观察,在–60℃拉伸的管材中观察到明显的孪生,而在350℃拉伸的管材中没有观察到孪生现象。结果表明:孪生对不同温度下TA18钛合金管材的塑性变形起着至关重要的作用。The tensile tests of Ti-3Al-2.5V （TA18） tubes with the diameter of 16 mm by cold rolling were accomplished on an electro-hydraulic servo material testing machine at -60, 25, 100, 200, 300 and 350 ℃, respectively. Meanwhile, microstructure of TA18 titanium alloy tubes after fracture was observed by TEM when tests were carried out at different temperatures. The results indicate that the tensile strength and the elongation of TA18 titanium alloy tubes decreases with the rise of temperature. There is a large amount of mechanical twins in the specimens deformed at -60 ℃, but they don’t exist at 350 ℃. It is concluded that twinning plays an important role in the process of TA18 titanium alloy tubing deformation.

关 键 词：TA18合金 塑性变形 孪生 

分 类 号：TG146.23[一般工业技术—材料科学与工程]