摘要
设计和制备了一种新型的中子和γ射线辐射屏蔽复合材料。基于蒙特卡罗模拟,首次采用球磨法和SPS加热轧制法制备了不同W含量(40%~70%,质量分数)的新型(W+B)/6061Al复合材料,并对其组织和力学性能进行了研究。实验结果显示,轧制之后,W和B颗粒均匀分布于基体中,而且W/Al界面以固溶体的形式呈现出良好的冶金结合。复合材料的物相主要包括W和Al。EBSD结果表明,W颗粒具有促进动态再结晶(DRX)成核、限制晶粒长大和降低6061Al基体织构的作用。拉伸试验表明,W含量为50%的复合材料强度最高,塑性较好。结合模拟结果,该组分的复合材料性能达到了实际应用要求。(W+B)/6061Al复合材料的强化机理包括位错强化和载荷传递效应。
A new kind of radiation shielding composite against both neutron and gamma rays was designed and fabricated. Based on Monte Carlo simulations, novel(W+B)/6061 Al composite sheets with different W contents(40 wt%~70 wt%) were first fabricated by ball-milling and SPS(spark plasma sintering) followed by hot-rolling, and then the microstructure and mechanical properties were investigated. Results show that after rolling process, W and B particles are uniformly distributed in the matrix and the interface of W-Al exhibits a good metallurgical bonding in the form of solid solution. The composites mainly consist of W and Al phases. EBSD results show that W particles have the effects of promoting dynamic recrystallization(DRX) nucleation, confining the grain growth and reducing the texture of 6061 Al matrix. Through tensile tests, the composite with 50 wt% W shows the highest strength and better plasticity. Together with the simulation results, composite with 50 wt% W is believed to meet the demand of practical applications. The strengthening mechanism of(W+B)/6061 Al composites includes dislocation strengthening and load transfer effect.
作者
张宇阳
王文先
陈洪胜
刘瑞峰
张媛琦
石宁
Zhang Yuyang;Wang Wenxian;Chen Hongsheng;Liu Ruifeng;Zhang Yuanqi;Shi Ning(Shanxi Key Laboratory of Advanced Magnesium-based Materials,Taiyuan University of Technology,Taiyuan 030024,China;College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2020年第3期787-796,共10页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(51775366,51805358)。
