碳化物添加对机械合金化V-4Cr-4Ti的强化影响研究

V-4Cr-4Ti alloy is assigned as an attractive candidate structural material for liquid Li blanket of fusion reactors in the future. Nowadays, the high-temperature strength of this alloy still needs to be increased further, thus more and more researchers have focused their efforts on the strengthening of V-4Cr-4Ti by mechanical alloying. Previous study has indicated the addition of Ti3SiC2 can remarkably enhance the thermal stability of the strengthening for V-4Cr-4Ti via mechanical alloying. This work, as a continuity, will add different carbides including Ti3SiC2 as dispersion agents to strengthen the V-4Cr-4Ti alloy, aiming at studying the effects of different nano-particles on the strengthening of V-4Cr-4Ti alloy at high temperatures more systematically and in more depth. Mechanical property tests and microstructural observations are planned to investigate the thermal stability of potential strengthening and the related mechanisms. This study is expected to benefit the high temperature resistance of V-4Cr-4Ti alloy for fusion application, and the relevant strengthening mechanisms are expected to provide the other metals with scientific principles for strengthening via mechanical alloying.

V-4Cr-4Ti合金是未来核聚变堆中液态锂自冷包层的候选结构材料。针对该合金的高温强度还应进一步提升的需求，越来越多的研究人员开始尝试机械合金化强化研究。在前期研究中，申请人已发现了Ti3SiC2的添加可以明显提高机械合金化V-4Cr-4Ti材料的强化热稳定性。本项目拟延续性地，添加含Ti3SiC2在内的不同碳化物颗粒来强化该合金，进而更系统和深入地研究不同纳米粒子对V-4Cr-4Ti强化的高温特性。实验将通过力学性能测试和微观结构分析，研究不同纳米粒子对该合金强化的热稳定性及其内在机理。本项目的实施，对提升聚变堆用钒合金的抗高温变形能力有重要现实意义；所研究出的强化规律也可望为其它金属材料的机械合金化强化提供潜在的科学依据。

V-4Cr-4Ti合金是未来核聚变堆中液态锂自冷包层的候选结构材料。针对该合金的高温强度还应进一步提升的需求，项目添加含Ti3SiC2在内的不同碳化物颗粒来强化该合金。试验利用机械合金化的方式制备了数种含碳化物的钒合金，重点研究了Ti3SiC2对钒合金强化的热稳定性及其内在机理，并进行了力学性能的评估及微观结构的观察。试验结果进一步证明Ti3SiC2对钒合金具有良好的强化作用，其科学机理可能是共格强化。该机理还延伸应用到铁素体钢的Cr2AlC添加强化上，高温退火后也获得明显的强化效果和优异的热稳定性。