Extraordinary high ductility/strength of the interface designed bulk W-ZrC alloy plate at relatively low temperature.
Extraordinary high ductility/strength of the interface designed bulk W-ZrC alloy plate at relatively low temperature.
复制标题
界面设计的大块 W-ZrC 合金板在相对较低的温度下具有极高的延展性/强度
DOI：
10.1038/srep16014
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发表时间：
2015-11-04
影响因子：
4.6
通讯作者：
Liu X
中科院分区：
文献类型：
--
作者：
Xie ZM;Liu R;Miao S;Yang XD;Zhang T;Wang XP;Fang QF;Liu CS;Luo GN;Lian YY;Liu X
高延性/高强度/高塑性的耐火钨合金被广泛应用于各种关键领域。本文报道了一种界面设计方法，该方法可获得厚度为8.5 mm的W-0.5 重量%锆合金板，其室温弯曲强度为2.5 GPA，应变为3%，韧脆转变温度约为100 °C，抗拉强度分别为991 Mpa和582 Mpa，总延伸率分别为1.1%和41%(500 °C)。此外，W-ZRC合金板材可以承受3.3MJ/m2的热负荷，没有任何裂纹。该工艺提供了特殊的晶界/相界面(Gb/PbS)和晶界上O杂质的减少，显著强化了Gb/PbS，从而提高了W合金的塑性/强塑性。该设计思想可用于未来制备具有更高延性/强度的新型合金。
The refractory tungsten alloys with high ductility/strength/plasticity are highly desirable for a wide range of critical applications. Here we report an interface design strategy that achieves 8.5 mm thick W-0.5 wt. %ZrC alloy plates with a flexural strength of 2.5 GPa and a strain of 3% at room temperature (RT) and ductile-to-brittle transition temperature of about 100 °C. The tensile strength is about 991 MPa at RT and 582 MPa at 500 °C, as well as total elongation is about 1.1% at RT and as large as 41% at 500 °C, respectively. In addition, the W-ZrC alloy plate can sustain 3.3 MJ/m2thermal load without any cracks. This processing route offers the special coherent interfaces of grain/phase boundaries (GB/PBs) and the diminishing O impurity at GBs, which significantly strengthens GB/PBs and thereby enhances the ductility/strength/plasticity of W alloy. The design thought can be used in the future to prepare new alloys with higher ductility/strength.