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Cu-Zn合金中β''→β转变动力学 总被引:1,自引:3,他引:1
用DSC法研究了Cu-Zn合金组织中β'→β转变动力学.结果表明,Cu-zn合金以10℃/min升温时的β'→β转变起始温度为446.23℃,结束温度为460.42℃,转变时间为114.84 S,合金的转变表观激活能为4147.72kJ/mol;当转变体积分数小于50%时,其转变激活能变化不大,然后,随着转变体积分数的增加,其转变激活能逐渐减小. 相似文献
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A Ca-P coating consisting of biodegradableβ-tricalcium phosphate[β-TCP,β-Ca3(PO4)2]accepted for medical application was coated on a biodegradable AZ31 alloy by chemical deposition to improve the corrosion resistance.The good bonding strength of the coating is obtained.The results show that the corrosion potential of the Ca-P coated AZ31 alloy increases significantly,and MG63 cells show good adherence,proliferation and differentiation on the surface of the coated alloy.The Ca-P coating might be an effective way to improve the surface bioactivity of magnesium alloys. 相似文献
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A copper matrix composite reinforced by β-LiAlSiO4 with negative thermal expansion coefficient was fabricated using vacuum hot-pressed sintering technique. The thermal expansion behavior of the composite was investigated, and the average residual stress in the matrix was analyzed by a simple model. The results indicate that the residual stress in the matrix affects the thermal expansion properties. After heat treatment, the coefficient of thermal expansion (CTE) of the composite decreases greatly. The CTE of the composite after thermal cycling between 50-350℃ is the lowest. 相似文献
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In order to study the luminescent properties of ternary rare earth complexes with fl-diketone ligand,three new β-diketone ligands,1-phenyl-3-(p-phenylethynylphenyl)-1,3-propanedione(HPPP), 1-(2-thienyl)-3-(p-phenylethynylphenyl)-l,3-propanedione (HTPP) and 1-(2-furyl)-3-(p-phenylethynylphenyl)-1,3-propanedione (HFPP),were synthesized by Sonogashira coupling reaction and Claisen condensation.Three new ternary rare earth complexes,TbL3phen (L = PPP,TPP,or FPP),were synthesized by the reaction of rare earth chloride TbCl3,1,10-phenanthroline (phen) with HPPP,HTPP,or HFPP respectively,in alcohol solution.The compositions were characterized by means of elernental analysis,chemical analysis,and IR spectra.Luminescent properties of the three new complexes have been studied.The results show that the ternary Tb(Ⅲ) complexes only emit the weak fluorescence of the Tb(Ⅲ) ion,which reveals the triplet state energy of the ligands does not match well with the excited state vibrating energy of Tb3+ ion. 相似文献
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Ti-23Nb-0.7Ta-2Zr-O (TNTZO, molar fraction, %) alloy is a newly developed multifunctional r-type titanium alloy. This alloy was reported to deform via a unique dislocation-free deformation mechanism, and thus its recovery and recrystallization behavior should be further studied and compared with traditional BCC metals. The substructures of the cold-swaged and the annealed TNTZO alloy were investigated by transmission electron microscopy(TEM) to study the recovery of the cold-swaged TNTZO alloy. The results show that no dislocation can be distinguished from the cold-swaged TNTZO alloy due to the heavily-accumulated strains, whereas high density dislocations were observed in the cold-swaged TNTZO alloy after annealing at 800 ℃ for 5 min. During annealing, recovery proceeds through the redistribution and annihilation of the dislocations, which are considered to result from the plastic deformation and the recovery process of the cold-swaged TNTZO alloy is similar to that of ordinary BCC metals. 相似文献
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Effect of pre-aging on precipitation behavior of Al-1.29Mg- 1.22Si-0.68Cu-0.69Mn-0.3Fe-0.2Zn-0.1Ti alloy 总被引:3,自引:0,他引:3
1 Introduction Aluminum alloys of the 6000 series, containing Mg and Si as the major solutes, are strengthened by the precipitation of metastable precursors of the equilibrium β(Mg2Si) phase. The precipitation of these metastable precursors occurs in on… 相似文献
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对不锈钢材料数控车削加工的特点进行分析,论述了在数控车削不锈钢零件时,通过合理收变钢材料的硬度、选择切削刀具与切削用量以及选用适当的冷却液等加工工艺措施,可显著提高不锈钢零件车削的效率。 相似文献
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用正交实验法研究了AISI304奥氏体不锈钢低温离子渗碳工艺。结果表明,优化后的奥氏体不锈钢低温离子渗碳工艺参数为渗碳温度500℃、C3H8:H2=1:30、氩气流量20ml/min、渗碳时间6h。用优化工艺参数处理的奥氏体不锈钢表面可获得单一的Sc相组织,硬度高达780HV0.05。 相似文献
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AISI 304奥氏体不锈钢低温离子渗碳工艺优化研究 总被引:1,自引:0,他引:1
用正交实验法研究了AISI 304奥氏体不锈钢低温离子渗碳工艺。结果表明,优化后的奥氏体不锈钢低温离子渗碳工艺参数为渗碳温度500℃、C3H8:H2=1:30、氩气流量20 ml/min、渗碳时间6 h。用优化工艺参数处理的奥氏体不锈钢表面可获得单一的Sc相组织,硬度高达780 HV0.05。 相似文献
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目的 提升普通涂层麻花钻加工奥氏体不锈钢的效率。方法 采用刀具基体及涂层前沿抛光处理技术,按照涂层前抛光及涂层前、后均抛光的不同工艺路线分别制备硬质合金麻花钻,选取制作的2种抛光涂层麻花钻与未经过抛光工艺处理的涂层麻花钻开展钻削奥氏体不锈钢试验,综合分析涂层前、后抛光处理工艺对涂层硬质合金麻花钻耐用度、磨损形貌及磨损机理的影响趋势。结果 涂层硬质合金麻花钻初始表面经抛光工艺处理后,槽前刀面粗糙度均值由10.77μm降低为5.09μm,降幅达52.7%,涂层表面质量获得显著提升。当切削工况一致时,涂层前、后均抛光麻花钻及涂层前抛光麻花钻的耐用度比未抛光涂层麻花钻分别提升了150%、106.1%;涂层前、后均抛光麻花钻的耐用度比涂层前抛光麻花钻提升了21.3%。未抛光涂层麻花钻的失效原因为月牙洼磨损、刀尖崩缺及切屑黏结;涂层前抛光麻花钻的失效原因为月牙洼、周刃磨粒磨损及涂层脱落;涂层前、后均抛光麻花钻的失效原因为周刃微崩、涂层脱落及切屑黏结,损伤程度最轻微。结论 普通涂层麻花钻基体及涂层表面抛光处理技术对降低其加工奥氏体不锈钢的损伤程度、延长切削寿命具有十分显著的优势,可大幅度提高刀具的综... 相似文献
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奥氏体及双相不锈钢铁素体含量测定方法探讨 总被引:2,自引:0,他引:2
全面介绍了检测奥氏体及双相不锈钢中铁素体含量的三种常用方法:化学分析-图谱法,金相法及磁性法。应根据检测对象选择合适的检测方法。 相似文献
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Z.W.Yu L.Wang X.L.Xu J.B.Qiang 《金属学报(英文版)》2004,17(2):210-214
The growth process of low-temperature plasma-nitriding layer was investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD).The layer is composed of expanded fcc phase (γN),whose lattice parameter of the layer increases with process time resulting from increasing the nitrogen content. The layer hardness increases gradually with nitrogen content. The high slip band density on the layer surface observed in situ by SEM shows that the surface yield occurs when supersaturated nitrogen content in the layer attains to some value,which is also responsible for the increase in laver hardness. 相似文献