Fe-Cu-Sn烧结体的显微组织与力学性能  

Microstructure and mechanical properties of Fe-Cu-Sn sintered alloy

作　　者：何娟[1] 王日初[1] 彭超群[1] 郑虎春[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《粉末冶金材料科学与工程》2011年第1期38-43,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家民口配套科研项目(MKPT-03-182)

摘　　要：分别采用水雾化Fe-30%Cu合金粉末和单质Sn、Fe、Cu元素粉末为原料制备Fe-Cu-Sn合金,研究原料粉末和Sn含量(质量分数)对Fe-Cu-Sn烧结体致密度、冲击韧性、硬度和抗弯强度的影响。结果表明:与采用元素混合粉末相比,采用合金化程度较高的Fe-30%Cu(质量分数,下同)合金粉末为原料能大幅提高850℃烧结的Fe-Cu-5%Sn合金的致密度和力学性能,其致密度由82.8%提高到94.3%,硬度、冲击韧性和抗弯强度分别提高52%、84%和109%;当Sn的质量分数w(Sn)为3%～15%时,随着Sn质量分数增加,合金的硬度增大,冲击韧性和抗弯强度先增加后减小,其中w(Sn)为5%时,其抗弯强度和冲击韧性都较高,分别为977 MPa和11.6 J/cm2。当烧结体为"双重结构"组织时,其力学性能显著提高。Fe-Cu-Sn alloy was prepared by powder metallurgy using raw material of water atomized Fe-30%Cu alloy powder and Sn,Fe,Cu element powders as raw materials.The effects of raw materials,the Sn content（mass fraction） on relative density,impact toughness,hardness and transverse rupture strength were studied.The results show that the Fe-Cu-5%Sn（mass fraction） alloy sintered at 850 ℃ using higher quality Fe-30%Cu alloyed powders as raw materials has higher relative density and higher mechanical properties than that of Fe-Cu-Sn alloy prepared by using the mixed element powders as raw materials.The relative density of Fe-Cu-Sn alloy prepared using alloyed powder increases from 82.8% to 94.3%,the hardness,impact toughness,transverse rupture strength increases 52%,84%,and 109% respectively.When Sn mass fraction is in the range of 3%~15%,the hardness of the alloy increases,and the transverse rupture strength as well as impact toughness increases firstly and then decreases with the increasing of Sn mass fraction.When w（Sn） is 5%,transverse rupture strength with 977 MPa and impact toughness with 11.6 J/cm2 have obtained.The mechanical properties increase observably when Fe-Cu-Sn alloy has the ＂Dual Structure＂ microstructure.

关 键 词：Fe-Cu-Sn烧结体 Fe-Cu合金粉末 力学性能 “双重结构”组织 

分 类 号：TF124[冶金工程—粉末冶金]