材料科学
微观结构
放电等离子烧结
复合材料
断裂韧性
穿晶断裂
烧结
极限抗拉强度
晶界
晶间断裂
作者
Chang Chen,Sanfeng Qian,Rui Liu,Shan Wang,Bin Liao,Zhihong Zhong,L.F. Cao,J.W. Coenen,Yucheng Wu
标识
DOI:10.1016/j.jallcom.2018.11.346
摘要
In order to improve the toughness of W, a series of W/Ti multilayer composites are prepared by spark plasma sintering ranging from 1000 °C to 1400 °C. The relation between the microstructure and the properties is systematically investigated. The W/Ti multilayer laminates have a better comprehensive property when the sintering temperature is between 1000 °C and 1200 °C. Under those conditions, the elongated grains in the W layers are maintained. Meanwhile, the interface microstructure of the laminates can be divided into three layers, including β-W(Ti) solid solution with lamellas, β-Ti(W) solid solution and nanosized martensite with a β-matrix and α phase in basketweave microstructure. The orientation relationship between the α-Ti variants and the β-Ti matrix is determined to be the Burgers orientation relationship. The intervariants boundaries between different α colonies are 60°/[112¯0]. The fracture mechanism of the composites shows a mixed facture mode and debonding of the interfaces. The fracture of the W layers is transgranular cleavage fracture and lamellas fracture, and the fracture of the Ti layers is ductile fracture with dimples.
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