材料科学
复合材料
等轴晶
络腮胡子
形状记忆合金
极限抗拉强度
复合数
烧结
钢筋
变形(气象学)
马氏体
微观结构
热压
无扩散变换
作者
Kuishan Sun,Bin Sun,Xiaoyang Yi,Yaqian Yang,Xianglong Meng,Zhiyong Gao,Wei Cai
标识
DOI:10.1016/j.jallcom.2022.164739
摘要
In the present study, lightweight high-strength Ti-V-Al based high temperature shape memory composites were fabricated to broaden the application of shape memory alloys. In-situ TiB whiskers and La2O3 particles were introduced and the distribution of reinforcements was optimized by the combination of low-energy milling, hot-press sintering and subsequent hot rolling. The in-situ reinforcements formed a network structure, which evolved from an equiaxed shape to an ellipsoidal shape. Furthermore, the direction of the reinforcement was inclined to the rolling direction. In the reinforcement-lean area, the phase constitution evolved from the β parent phase to the α″ martensite phase, and the width of the α″ martensite gradually widened with increasing distance to the in-situ reinforcements. The composites maintained high martensitic transformation temperature characteristics. Excellent mechanical properties with a high tensile strength of 885 MPa and a large elongation of 13.1% are obtained in the composite with a 1.0 wt% LaB6 addition and 70% deformation ratio. Meanwhile, the composite realized 3.49% recoverable strain under 6% pre-strain conditions.
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