摘要
为了满足高功率密度柴油机缸盖低密度高性能的要求,文中通过机械合金化与热压烧结相结合的方法制备了Fe-50%NiAl合金,利用万能试验机对该合金的室温至600℃高温拉伸性能进行了研究。研究结果表明:热压烧结后的Fe-50%NiAl合金的组织主要为Fe相和B2结构NiAl相;该合金的抗拉强度和延伸率均随温度的升高而降低;其室温性能较为优异,抗拉强度为781.72 MPa,延伸率为7.75%;断口分析发现,Fe-50%NiAl合金拉伸断裂过程中,裂纹萌生于NiAl相中,沿着NiAl相和Fe相的界面扩展,终止于Fe基体中。
In order for the high power density diesel engine cylinder head to have low density and high performance,Fe-50%NiAl alloy was prepared by mechanical alloying and hot pressing sintering.Its tensile properties at the room temperature to 600℃were studied by universal testing machine.The results show that the microstructure of Fe-50%NiAl alloy is mainly composed of Fe phase and B2 NiAl phase.Its tensile strength and elongation decrease as the temperature rises,with the tensile strength being 781.72 MPa and the elongation 7.75%.The fracture analysis shows that during the tensile fracture of Fe-50%NiAl alloy,the cracks initiate in NiAl phase,propagate along the interface between NiAl phase and Fe phase and terminate in Fe matrix.
作者
李梦
白亚平
李建平
孙崇锋
杨忠
LI Meng;BAI Yaping;LI Jianping;SUN Chongfeng;YANG Zhong(School of Materials Science and Chemical Engineering,Xi’an Technological University,Xi’an 710021,China)
出处
《西安工业大学学报》
CAS
2021年第4期447-454,共8页
Journal of Xi’an Technological University
基金
国家自然科学基金青年基金(51705391)
陕西省自然科学基础研究计划(2021JM-429)
陕西省教育厅青年创新团队建设科研计划(21JP051)。
