CAJ | 학술논문

对粉末冶金法制备的两种不同钨含量的钨合金材料进行SHPB试验和原位拉伸试验,研究了钨合金中钨含量与其显微组织、断裂方式及力学性能之间的关系.结果表明,在拉伸情况下随着钨含量的增加,钨合金的破坏方式由W-W间开裂转变为钨颗粒开裂,材料由韧性变为脆性.利用Ostwald烧结理论,对两种材料的微观结构进行预测,结果与实验符合较好.利用细观力学模型对所观察的实验结果进行了定量解释.烧结理论和细观力学相结合,可建立材料烧结条件、体积分数及力学性能之间的关系,为材料的设计、制备和力学性能的预测提供理论依据.
대분말야금법제비적량충불동오함량적오합금재료진행SHPB시험화원위랍신시험,연구료오합금중오함량여기현미조직、단렬방식급역학성능지간적관계.결과표명,재랍신정황하수착오함량적증가,오합금적파배방식유W-W간개렬전변위오과립개렬,재료유인성변위취성.이용Ostwald소결이론,대량충재료적미관결구진행예측,결과여실험부합교호.이용세관역학모형대소관찰적실험결과진행료정량해석.소결이론화세관역학상결합,가건립재료소결조건、체적분수급역학성능지간적관계,위재료적설계、제비화역학성능적예측제공이론의거.
Dynamic compression and in-situ tensile tests were carried out for two kinds of W-Ni-Fe alloys with 93wt% and 97wt% tungsten contents fabricated by P/M technique; their microstructures and damage model were examined and discussed. The damage mechanisms for 93wt% W alloy belongs to ductile separation of W-W interface, and that for 97wt% W alloy belongs to initiation and propagation of microcracks inside tungsten grains. On the base of Ostwaid ripening theory for the sintering process, the microstructures of the two kinds of alloys with different tungsten volume fractions under various sintering conditions were predicted, and the results agreed with the tests very well. With the help of Ostwald ripening and micromechanical theory, we set up a relationship for sintering condition, volume fraction of tungsten and mechanical properties to help material design, production and mechanical property prediction.