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improve the compressive properties of NiAl–28Cr-5.5Mo-0.5Hf alloys. The microstructural refinement and the stronger precipitation strengthening mechanisms are responsible to the improvement...: NiAl-28Cr-5.5Mo-0.5Hf; processing; microstructure refinement; precipitation strengthening; high solidification rate 1 Introduction Intermetallic alloys based on nickel aluminium (NiAl) are subjects......
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rolling-on-line solution-cold rolling-aging condition exist in the form of Fe and Fe3P. Sub-structure strengthening coming from the thermo-mechanical treatment and precipitation strengthening of Fe and Fe3P particles is responsible for high strength of the alloy. Key words: Cu-2.5Fe-0.03P alloy; microstructure; properties evolution; precipitation strengthening  ......
and Engineering of Ministry of Education, Changsha 410083, China Received 29 June 2009; accepted 25 August 2009 Abstract: The precipitation behaviors of the Cu-Ni-Si alloys during aging were studied... that the precipitates are β-Ni3Si and δ-Ni2Si phases. Key words: Cu; Cu-Ni-Si alloy; dynamics; phase transformation; precipitation; electrical conductivity 1 Introduction Cu-Ni-Si alloys are used......
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不同卷取温度低碳钢性能及硫化物析出的研究王岩1,赵爱民1,陈银莉1,左碧强1,薛俊平2(1.北京市北京科技大学冶金工程研究院2.首钢技术研究院,北京 100041)摘 要:运用拉伸,金相,析出物定量分析,SEM,TEM和EDS等测试方法,对不同卷取温度低碳钢组织性能及硫化物析出进行研究.结果表明:随着卷取温度的升高,钢的强度和晶粒度等级下降.MnS析出主要分2个阶段:第1阶段主要为奥氏体区MnS和Al2O3的复合析出,析出尺寸普遍介于1~5μm之间,形状为条片状;第2阶段为MnS在卷取过程中析出,尺寸普遍介于2......
Eu0.12Y1.88-xMxO3-δ (M=Mg, Ca) was prepared by ultrasonic and homogeneous precipitation method. X-ray diffraction(XRD), transmission electron microscope (TEM) and fluorescence spectrum were employed to analyze... precipitation method; photoluminescence; doped Y2O3?Eu3+是一种重要的红色稀土发光材料,具有化学性能稳定,色纯度好,发光效率高等优点,被广泛用于节能荧光灯中,也是制备复印灯和紫外真空激发的气体放电彩色显示板的荧光材料[1].Y2O3?Eu3+纳米晶荧光粉比体相材料颗粒减小,比表面积增大,发光颗粒增加,可以显著改善阴极射线管涂屏的均匀性,提高图像显......
that, with the prolongation of keeping time at the nose temperature, the quench-induced precipitation phenomenon becomes obvious. The quench-induced η precipitates nucleate and precipitate at grain and sub-grain boundaries... be helpful to relieve the residual stresses. Key words: Al-Zn-Cu-Mg alloy; quench sensitivity; TTP curve; precipitation 7×××系(Al-Zn-Mg-Cu)合金具有较高的室温强度和良好的综合性能,是世界各国航空,航天,交通运输等领域不可或缺的结构材料[1-2].经过80多年的发展......
410083, China) Abstract: Effects of different heat treatment conditions on the structure and property of CeO2 nanocrystalline synthesized by precipitation method were studied with XRD method combining... nanocrystallite; precipitation method; calcination; structure; property <上一页 1 ... 11 12 13 14 15 16 17 18 19 20 ... 3354 下一页 >