【作者】 刘红梅； 陈云贵； 唐永柏； 黄德明； 牛高； 涂铭旌； 赵敏； 李益国；

【Author】 Liu Hongmei , Chen Yungui , Tang Yongbai , Huang Deming , Niu Gao , Tu Mingjing , Zhao Min, Li Yiguo(School of Materials Science and Engineering , Sichuan University , Chengdu 610065, China;Chengdu Engine Ltd Company, Chengdu 610067, China)

【机构】 四川大学材料科学与工程学院； 成都发动机(集团)有限公司；

【摘要】 研究了加入0．4％～2．0％Nd-Pr混合稀土金属(Nd:Pr=3:1)对Mg93.64Al6C0．12B0.24镁合金力学性能的影响。通过显微组织观察,发现随着Nd-Pr稀土含量的增加,合金组织得到细化,且细小的针状稀土析出相增多。XRD分析表明,合金由α-Mg,Mg17Al12,Al2Nd,Mg12Pr及少量的Al0.3B48C2相组成;合金的晶格常数稍有增大(未加稀土时合金的晶格常数α=0．3192nm,c=0．5182 nm;加入稀土后合金的晶格常数α =0．3199 nm,c=0．5192 nm),这是由于Nd固溶于α-Mg引起晶格畸变造成。力学性能测试结果表明:随着合金中稀土元素含量的增加,抗拉强度及伸长率都显著提高,提高幅度分别为21．7％和65．3％。力学性能的改善与Nd,Pr元素的细晶强化和固溶强化有关。更多还原

【Abstract】 The effects of neodymium-praseodymium mixed rare earths metal (Nd:Pr = 3 :1) on the micro-structure and mechanical properties of Mg93.64Al6C0.12 B0.24 alloys were studied with the addition of 0.4%-2.0% Nd-Pr. It can be found by optical microscopy that the Nd-Pr-containing fine needle-shaped second phases on the grain boundaries increase and the grain of alloy is refined with the increases of RE addition. X-ray diffraction (XRD) analysis show that the alloy is composed of α-Mg, Mg17Al12, Al2Nd, Mg12Pr and a little Al 3B48C2 phases, and the crystal lattice parame- ters of the alloy increase slightly with the addition of Nd-Pr mixed metal, where the main reasons is from the solid solution of Nd-Pr. The mechanical properties experiments indicate that the tensile strength and elongation of the alloys are obviously improved when Nd-Pr content rises and their maximum enhancing rates are 21.7% and 65.3% at 2% Nd-Pr, sespectively, and the main reason of which is attributed to the grain refinement and solid solution strengthening by Nd-Pr metal.更多还原