U-Ti合金的动态压缩性能及剪切特征  

Dynamic Compression Performances and Adiabatic Shearing Characters of U-Ti Alloys

作　　者：刘婷婷 张鹏程 何立峰[2] 白彬 

机构地区：[1]表面物理与化学国家重点实验室,四川绵阳621790 [2]中国工程物理研究院,四川绵阳621900

出　　处：《稀有金属材料与工程》2010年第5期800-803,共4页Rare Metal Materials and Engineering

摘　　要：采用分段式霍普金森杆(SHPB)及材料试验机测试200℃时效4h的U-Ti合金在室温下的动静态压缩力学性能,采用扫描电镜和金相显微镜分析U-Ti合金动态压缩后的绝热剪切特征。结果表明,U-Ti合金是应变速率敏感材料,产生了应变速率强化效应;当应变速率为3600s-1时,U-Ti合金已经发生45°剪切断裂;当应变速率达到5000s-1时,U-Ti合金剪切断裂的同时产生烧蚀变形,剪切断口上出现塑性金属的韧窝特征;当应变速率为7300s-1时,U-Ti合金45°剪切断面上出现了重熔现象。The quasi-static and dynamic compression mechanical performances of the U-Ti alloys aged at 200℃ for 4 h were tested by a mechanical equipment and Split Hopkinson Pressure Bar（SHPB） at room temperature.The adiabatic shearing characters of U-Ti alloys after dynamic compression were analyzed by SEM and OM.The results show that the U-Ti alloys are sensitive to strain rate because there is strengthening effect of strain rate.The 45° shear fracture had been yielded in the U-Ti alloys at the strain rate of 3600 s-1.Both the 45°shear fracture and ablative deformation were observed in U-Ti alloys when the strain rate reached 5000 s-1.Refusion phenomenon was found on the 45° fracture surface at the strain rate of 7300s-1.The fracture morphology exhibits dimple character of plastic metal.

关 键 词：U-Ti合金 SHPB 剪切 

分 类 号：TG146.23[一般工业技术—材料科学与工程]