• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering >Microstructural morphology effects on fracture toughness and crack growth behaviors in a high strength titanium alloy
【24h】

Microstructural morphology effects on fracture toughness and crack growth behaviors in a high strength titanium alloy

机译：高强度钛合金中裂缝韧性和裂纹生长行为的微观结构形态

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Tensile properties and fracture toughness of Ti-5Al-3Mo-3V-2Zr-2Cr-1Nb-1Fe (Ti-5321) alloy with bi-modal (BM), basket-weave (BW) and heterogeneous lamellar microstructure (HL) were investigated. The results showed that HL specimen with hierarchical features (e.g., mixtures of elongated β_t matrix, discontinuous grain boundary α, intragranular α colonies and α plates) exhibited the best combination of strength, ductility and fracture toughness. The fracture toughness was up to 102 MPa m~(1/2) with a yield strength of 1200 MPa and elongation of 14%. The toughening mechanisms and fracture behaviors in three microstructures were analyzed. The toughening mechanisms in HL primarily involved heterogeneous microstructure that acted to reduce local stress/strain distribution at crack tip and enlarged crack tip plastic zone (CTPZ), which lead to more energy consumption during plastic deformation. As for fracture behaviors, the fracture mode in three microstructures were predominantly dimple ductile fracture although the crack path were both transgranular and intergranular. Interactions between microstructure constituents and crack path were studied by EBSD to discuss the crystal-lographic crack propagation mechanisms in BW and HL.
机译：研究了Ti-5Al-3MO-3V-2ZR-2CR-1NB-1FE（TI-5321）合金的拉伸性和断裂韧性，具有双模态（BM），篮织织物（BW）和异质层状微观结构（HL） 。结果表明，具有分层特征的HL样品（例如，细长β_T矩阵的混合物，不连续晶界α，骨膜α菌落和α板）表现出强度，延展性和断裂韧性的最佳组合。断裂韧性高达102MPa m〜（1/2），屈服强度为1200MPa，伸长率为14％。分析了三种微观结构中的增韧机制和断裂行为。 HL中的增韧机制主要涉及异质的微结构，其作用以减少裂纹尖端和扩大裂纹尖塑区（CTPZ）的局部应力/应变分布，这导致塑性变形期间的能量消耗更多。对于裂缝行为，三种微观结构中的断裂模式主要是凹陷的延展性裂缝，但裂纹路径均为跨晶和晶间。通过EBSD研究了微观结构成分和裂纹路径之间的相互作用，讨论了BW和HL中的晶体纸裂纹传播机制。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号