粉末冶金技术2026，Vol.44Issue(1)：42-53,12.DOI:10.19591/j.cnki.cn11-1974/tf.2025030013
W-Ni-Fe-Mo/Co梯度结构钨合金的制备及力学性能
Fabrication and mechanical properties of gradient-structured W-Ni-Fe-Mo/Co tungsten heavy alloys
摘要
Abstract
Gradient-structured tungsten heavy alloys with spatially graded mechanical properties can effectively resolve the strength-ductility trade-off in conventional homogeneous tungsten alloys.The high-strength 93W-Ni-Fe-Mo alloys and high-ductility 90W-Ni-Fe-Co alloys were separately developed through the optimized design.The co-sintering was employed to fabricate the gradient-structured tungsten alloys,and the microstructural characteristics and mechanical properties of the W-Ni-Fe-Mo/Co alloy systems and the W-Ni-Fe gradient-structured alloys were systematically investigated.In the results,the addition of Mo can effectively improve the tensile strength of 93W-Ni-Fe alloys and the introduction of Co can improve the ductility of 90W-Ni-Fe alloys.Being fabricated by integrated pre-sintering and stepwise sintering at 1480 ℃,the gradient tungsten alloys show about 20 μm interfacial layers.Tensile tests reveal the 1153.0 MPa strength(13.1％elongation)in the high-strength zone and the 972.6 MPa strength(21.5％elongation)in the high-ductility zone.The grain refinement and solid solution strengthening mechanisms are induced by Mo doping,however,the introduction with high content(Mo mass fraction ≥ 12％)can lead to the formation of MoNi intermetallic compounds at the W/γ binder phase interface,which can damage the plasticity.关键词
梯度结构/细晶强化/钨合金/固溶强化/力学性能Key words
gradient structure/grain refinement strengthening/tungsten heavy alloys/solid solution strengthening/mechanical properties分类
矿业与冶金引用本文复制引用
孟子琪,段有腾,刘文胜,马运柱,吴天昊,韩一帆,蔡青山..W-Ni-Fe-Mo/Co梯度结构钨合金的制备及力学性能[J].粉末冶金技术,2026,44(1):42-53,12.基金项目
湖南省自然科学基金(2023JJ10067) （2023JJ10067）
