基本信息
项目批准号：51661015
申请代码：E0106
项目名称：大块非晶合金在搅拌摩擦焊过程中塑性流动行為(wèi)研究
项目负责人：袁子洲
依托单位：兰州理(lǐ)工大學(xué)
研究期限：2017-01-01 至 2020-12-31
资助经费：40.0（万元）

项目摘要
中文(wén)摘要：
采用(yòng)搅拌摩擦焊（FSW）实现大块非晶合金（BMGs）之间的连接，可(kě)以克服BMGs制件尺寸小(xiǎo)、形状简单两大难题。然而，在FSW过程中，对接头质量起决定作用(yòng)的金属塑性流动行為(wèi)的研究目前未见报道。.本项目以综合性能(néng)优异的Cu36Zr48Ag8Al8 BMGs為(wèi)研究对象，采用(yòng)示踪材料法，分(fēn)别对不同形态的FSW焊接接头（无缺陷接头、隧道型缺陷接头及空洞缺陷接头）在形成过程中的金属塑性流动行為(wèi)进行跟踪观察，分(fēn)析总结非晶合金在高应变速率条件下的过冷液相區(qū)塑性流动行為(wèi)。然后，通过焊接接头的显微结构和力學(xué)性能(néng)对比，得到 FSW 过程中金属塑性流动行為(wèi)对接头显微结构和力學(xué)性能(néng)的影响规律以及作用(yòng)机理(lǐ)，并建立相关模型，指导生产实践。.本申请有(yǒu)助于揭示FSW接头的成形机理(lǐ)，帮助我们搞清楚FSW过程中BMGs显微结构的变化规律以及高冶金质量焊缝的形成条件，对于推动BMGs的工业化应用(yòng)进程具有(yǒu)重要的理(lǐ)论和工程价值。
英文(wén)摘要：
The two drawbacks of bulk metallic glasses (BMGs) parts, including small size and simple shape, can be overcomed by metallurgical bonding the BMGs with friction stir welding (FSW) technique. However, the flow behavior which decides the joint quality of BMGs during the FSW process has not been currently reported..In this project, Cu36Zr48Ag8Al8 BMGs with excellent mechanical performance will be chosen as research object. In order to analysis and summary the plastic flow behavior of BMGs in the supercooled liquid region under high strain rate, flow behaviors of different FSW welding joints during the FSW process will be observed using material tracing technique, including perfect joint, joint with tunnel defects and joint with cavity defects. Then microstructure and mechanical properties of the BMGs joints will be compared. The mechanism and influence rule of plastic flow behavior on microstructure and mechanical properties of the joints will be researched. In addition, related model will be set up, which can guide the production practice..The works will help us to reveal the forming mechanism of FSW joint and make clear microstructure evolution rule of BMGs during the FSW process. The forming conditions of FSW joint with high quality will also be defined. The results will promote the industrialization process of BMGs, which will be of great significance to the theoretical value and engineering application.
 
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