W-TiC合金面对等离子体材料及其电子束热负荷实验研究

W-TiC Alloy Plasma Facing Materials and Heat Flux Performance Test under Electron Beam Facility

摘要:

利用机械合金化方法制备各种W-TiC合金，并通过主要物理性能测试发现：TiC的引入能有效强化晶界，提高合金材料的力学性能，特别是W-1%TiC(质量分数, 下同)合金，其相对密度、抗弯强度、维氏显微硬度和杨氏模量分别为98.4%、1065 MPa、4.33和396 GPa。同时电子束热负荷实验发现：在低于合金再结晶温度时，TiC能有效增强合金热负荷承受能力；然而较高的晶粒应变能导致合金材料在再结晶温度以上使用时，热负荷性能增强效果不明显。这些结果显示，约1%TiC弥散增强钨合金是较合适的托卡马克高热负荷面对等离子体材料

Abstract:

W-TiC alloys were prepared by means of the mechanical alloying method and their main physical properties were tested. It is found that TiC particle introduction can strengthen the grain boundary notably and enhance the mechanical properties of the alloys. Particularly, the relative density, flexural strength, Vickers microhardness and elastic modulus of W-1wt%TiC alloy is 98.4%, 1065 MPa, 4.33 and 396 GPa, respectively. Meanwhile, the electron-beam heat-flux test show that TiC particles can effectively improve the heat flux properties of W-TiC alloy below the re-crystallization temperature; however, when the alloy is used above the re-crystallization temperature due to the higher grain strain energy, the effect is not notable. Therefore, the results indicate W-1wt%TiC is the suitable plasma facing material as the heat flux material below the re-crystallization temperature