Mn含量对梯度多孔Mg-Mn合金组织与性能的影响  

Microstructure and Properties of Gradient Porous Mg-Mn Alloys with Different Mn Contents

作　　者：于景媛[1] 王建中[1] 李强[1] 张峰峰[1] 商剑[1] 孙旭东[2] 

机构地区：[1]辽宁工业大学材料科学与工程学院,辽宁锦州121001 [2]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《稀有金属》2015年第4期314-321,共8页Chinese Journal of Rare Metals

基　　金：国家科技部高技术研究发展计划项目(863计划)(2011AA060102);国家自然科学基金青年科学基金项目(51405215);辽宁省自然科学基金项目(2014020111);辽宁省高等学校杰出青年学者成长计划项目(LJQ2013067);辽宁省高等学校创新团队项目(LT2013014);辽宁省重点实验室基础研究项目(LZ2014031)资助

摘　　要：主要研究了Mn含量对梯度多孔Mg-Mn合金显微组织、物相组成、抗压强度、显微硬度以及耐腐蚀性能的影响。研究结果表明随着Mn含量的增加,梯度多孔Mg-Mn合金孔壁处晶粒烧结的致密化程度提高,晶粒细化,当Mn含量超过2%(质量分数)时,孔壁晶粒烧结的致密化程度略有降低。结合X射线衍射(XRD)仪和能谱(EDS)分析表明当Mn含量为2%时,梯度多孔Mg-Mn合金由单相α-Mg固溶体组成;当Mn含量为3%时,梯度多孔Mg-Mn合金由α-Mg和α-Mn两相组成。随着Mn含量的增加,梯度多孔Mg-Mn合金的抗压强度先增加而后降低,显微硬度持续增加;当Mn含量为2%时,烧结产物的抗压强度为34.1 MPa,显微硬度为HV48.5,分别比梯度多孔Mg合金提高52.2%和36.2%。耐腐蚀性分析表明,添加Mn元素后梯度多孔Mg-Mn合金的腐蚀速率降低,这表明梯度多孔Mg-Mn合金的耐腐蚀性增加。当Mn含量为2%时,梯度多孔Mg-Mn合金试样的腐蚀速率最低,耐腐蚀性能最佳。The effects of Mn contents on microstructure, phase composition, compressive strength, micro-hardness and corrosion re- sistance of gradient porous Mg-Mn alloys were studied. The resuhs showed the compact degree of the grains in the pore cell of gradient porous Mg-Mn alloys increased and the grain sizes decreased with the increase of Mn contents. But the compact degree of the grains in the pore cells of gradient porous Mg-Mn alloys decreased slightly when Mn content was beyond 2% （mass fraction）. X-ray diffraction （XRD） and energy dispersive spectrometer （EDS） analysis showed that the gradient porous Mg-Mn alloys were composed of single phase of a-Mg solid solution when Mn content was 2% ; they consisted of two phases of a-Mg and a-Mn when Mn content was 3%. With the increase of Mn content, the compressive strengths of gradient porous Mg-Mn alloys firstly increased and then decreased, but the micro-hardness of gradient porous Mg-Mn alloys kept increasing. The compressive strength and micro-hardness of the sintered com- pacts with 2% Mn were 34.1 MPa and HV48.5, respectively, which were 52.2% and 36.2% higher than those of gradient porous Mg compacts. Corrosion resistance measurement showed that the corrosion rates of gradient porous Mg-Mn alloys decreased with the addi- tion of Mn element, which indicated that the corrosion resistance of gradient porous Mg-Mn alloys increased. The minimum corrosion rate and best corrosion resistance of the gradient porous Mg-Mn alloys were obtained with 2% Mn content.

关 键 词：梯度多孔Mg合金 MN含量 显微组织 压缩性能 耐腐蚀性能 

分 类 号：TQ146[化学工程]