Fe－5Ni合金奥氏体高温变形行为

在温度９７３～１３７３Ｋ、形变速率２×１０－５～１．５×１０－１ｓ－１的试验条件下，研究了Ｆｅ－５Ｎ合金奥氏体的高温拉伸变形行为．结果表明：高温变形时峰值应力σｐ与温度Ｔ和形变速ε之间符合下式关系：Ｚ＝εｅｘｐ（Ｑ／ＲＴ）＝Ａ（ｓｉｎｈ（ａσｐ））ｍ。高应变速率区的表观激活能Ｑ为３１４ｋＪ／ｍｏｌ，与Ｆｅ的自扩散激活能Ｑｓｄ相当，变形由空位扩散所控制；而低应变速率区的Ｑ为２０２ｋＪ／ｍｏｌ，约为Ｑｓｄ的２／３，变形由晶界滑移所控制．     

热处理温度对铁基阻尼合金阻尼特性和磁性的影响

使用共振法、三电压法和３２５７型直流磁滞回线描绘仪，研究了热处理温度对铁基１２ＣｒＡＩＭｏ阻尼合金的阻尼本领Ｑ－１值、交流铁损Ｐ、磁感Ｂ和直流磁感Ｂ１０（１０Ａ／ｃｍ磁场强度下）以及矫顽力Ｈｃ的影响。结果表明，于９７５℃热处理后，Ｑ－１获最大值（１６．６×１０－３），比在８５０℃热处理的约高１６倍，Ｐ也于９７５℃达最大值，比８５０℃热处理的提高约５０％，Ｂ和Ｂ１０的最大值处于９７５～１０００℃热处理温度下，与８５０℃热处理后的相比，分别提高３—５１％和１００％，Ｈｃ于９７５℃热处理后获最小值，仅为８５０℃热处理后的２４％。     

5—（3—羧基苯偶氮）—8—氨基喹啉光度法测定微量钯

合成了新试剂５－（３－羧基苯偶氮）－８－氨基喹啉（ｍ－ＣＰＡＱ）在弱碱性介质中,Ｔｗｅｅｎ－８０和ＴｒｉｔｏｎＸ－１００存在下ｍ－ＣＰＡＱ与Ｐｄ（Ⅱ）生成紫蓝色三元络合物,λｍａｘ＝６１５ｎｍ,ε１＝８．４×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１,Ｐｄ在０～３０μｇ／２５ｍｌ符合比尔定律,用于岩矿中微量Ｐｄ的测定,结果满意。     

Fe-32Ni合金高温变形与再结晶行为

在温度１１７３～１３２３Ｋ、形变速率２×１０－５～２×１０－１ｓ－１的试验条件下,研究了Ｆｅ３２Ｎｉ合金的高温压缩变形与再结晶行为。结果表明,高温变形时应力应变曲线上峰值应力σｐ与温度Ｔ和形变速率ε之间符合下式关系：Ｚ＝ε·ｅｘｐ（Ｑ／ＲＴ）＝Ａ（ｓｉｎｈ（ασｐ））ｍ。其高温变形的表观激活能Ｑ约为３７８ｋＪ／ｍｏｌ,与该合金中Ｆｅ的自扩散激活能Ｑｓｄ相当,高温变形由空位扩散所控制     

RH法钢水定向循环流量操作模型的研究

在热力学和传输现象的基础上研究了ＲＨ－钢包系统中的定向环流。结果表明,真空度稳定时,Ｑ∝Ｈ＾１／３Ｇ＾１／３Ｄ＾４／３;真空度变化时,Ｑ∝Ｇ＾１／３Ｄ＾４／３「ｌｎ（ｐ１／ｐ２）」＾１／３。     

Ti_3Al基合金超塑形变的微观观察

Ｔｉ－２５Ａｌ－１０Ｎｂ－３Ｖ－１Ｍｏ（ａｔ．－％）合金在９００－９８０℃温度范围和１×１０~（－３）Ｓ~（－１）拉伸速率下显示了良好的超塑性能，δ＝３８２％．其超塑形变受控于晶界滑动（主要为α_２／α_２晶界滑动），并协调以扩散、位错、位错环和层错机制．扩散协调机制表现为螺旋位错和割阶的攀移，位错协调制主要为的位错的滑移．位错环主要为的切变型位错环，并伴有少量的扩散切变型位错环．     

Fe—5Ni合金奥氏体高温变形行为

在温度９７３－１３７３Ｋ，形变速率２×１０＾－５－１．５×１０＾－２ｓ＾－１的试验条件下，研究了Ｆｅ－５Ｎｉ合金奥氏体的高温拉伸变形行为。结果表明：高温变形时峰值应力σｐ与温度Ｔ和形变ε之间符合五式关系：Ｚ＝εｅｘｐ（Ｑ／ＲＴ）＝Ａ（ｓｉｎｈ（ασｐ））＾ｍ。高应变速率区的激活能Ｑ为３１４ｋＪ／ｍｏｌ，与Ｆｅ的自扩散激活能Ｑｓｄ相当，变形由空位扩散所控制；而低应变速率区的Ｑ为２０２ｋＪ／ｍｏｌ，约     

快速凝固（Sm1—xBx）Fe2合金的结构和磁性

采用真空单辊快淬法（铜辊,线速度达２０～２３ｍ／ｓ）将成分为（Ｓｍ１－ｘＢｘ）Ｆｅ２（ｘ＝０,０．０１５,０．０３,０．０４５,０．０６）合金锭,制成快速凝固的鳞片状合金,再经粉碎在３０ＭＰａ压力下,模压成φ１０ｍｍ圆片,然后进行ＸＲＤ分析,比磁化强度和磁致伸缩（λ″－λ┴）的测量。实验结果表明各样品只有少量非晶相,主要是ＳｍＦｅ２及少量的ＳｍＦｅ５和ＳｍＦｅ７化合物。样品（Ｓｍ０．９８５Ｂ０．０１５）Ｆｅ２和（Ｓｍ０．９４Ｂ０．０６）Ｆｅ２,在７２０ｋＡ／ｍ磁场下,比磁化强度分别为：５９．５,５２．３Ａｍ２ｋｇ－１,在８８５ｋＡ／ｍ磁场下（λ″－λ┴）分别为：－５１０×１０－６和－３１０×１０－６。     

Rh（III）—5—Br—PADAP配合物吸附波研究

Ｒｈ（Ⅲ）在０．１ｍｏｌ／Ｌ ＨＡｃ－０．１ｍｏｌ／Ｌ ＮａＡｃ，１。６０×１０＾－５ｍｏｌ／Ｌ５－Ｂｒ－ＰＡＤＡＰ和０．００２５％ＯＰ溶液（ＰＨ≈４．７）中，良好的极谱波，峰电位Ｅｐ＝－０．６４Ｖ（ｖｓ．ＳＣＥ）．Ｒｈ（Ⅲ）浓度在３．９０×１０＾－９～６．８０×１０＾－７ｍｏｌ／Ｌ（即０．４０～７０ｐｐｂ）与峰电流成线性关系；检出下限为１．９×１０＾－９ｍｏｌ／Ｌ。作直线法测定配合比为：Ｒｈ（Ⅲ     

电渣重熔用CaF_2＋Al_2O_3和CaF_2＋Al_2O_3＋CaO系熔渣传氧的研究

利用ＺｒＯ_２固体电解质氧浓差电池测定了电渣重熔用ＣａＦ_２＋Ａｌ_２Ｏ_３和ＣａＦ_２＋Ａｌ_２Ｏ_３＋ＣａＯ系熔渣的氧渗透率，考察了熔渣成分及温度对熔渣传氧性能的影响．在１６７３—１８７３Ｋ和０．１ＭＰａ的氧气氛下，侧得这两个渣系熔渣的氧渗透率分别为１×１０－（２０）—６×１０－（１９）和１×１０￣（２１）—５×１０￣（１８）ｍｏｌＯ_２·ｃｍ￣（－１）·ｓ￣（－１）；随ＭｎＯ_２，Ｆｅ_２Ｏ_３，Ｃｒ_２Ｏ_３，ＴｉＯ_２，ＣａＦ_２含量和碱度（ＣａＯ／ＳｉＯ_２）的增高，熔渣的氧渗透率增大，ＭｎＯ_２和Ｆｅ_２Ｏ_３的影响尤为显著；随温度的升高，熔渣的氧渗透率增大，且可按速率过程来处理ＣａＦ２基多元复杂熔渣的传氧过程。     

医用钛合金的微观组织与阻尼性能

为降低医用钛合金的弹性模量、提高阻尼性能,采用水冷铜坩埚感应熔炼技术熔炼TZNM合金,并对样品进行固溶处理.借助扫描电子显微镜、透射电子显微镜、化学分析法、维氏硬度实验、阻尼实验,研究了固溶处理前后TZNM合金的显微组织与力学性能.结果表明:TZNM合金的整体熔炼效果良好,化学成分符合预期设计,为典型的双相α+β型钛合...     

Dislocation structure evolution and characterization in the compression deformed Mn–Cu alloy

Dislocation densities and dislocation structure arrangements in cold compressed polycrystalline commercial M2052 (Mn–20Cu–5Ni–2Fe) high damping alloy with various strains were determined in scanning mode by X-ray peak profile analysis and electron backscatter diffraction (EBSD). The results indicate that the Mn–Cu–Ni–Fe alloy has an evolution behavior quite similar to the dislocation structure in copper. The dislocation arrangement parameter shows a local minimum in the transition range between stages III and IV that can be related to the transformation of the dislocation arrangement in the cell walls from a polarized dipole wall (PDW) into a polarized tile wall (PTW) structure. This evolution is further confirmed by the results of local misorientation determined by EBSD. In addition, during deformation, the multiplication of dislocation densities in the MnCu alloy is significantly slower than that in copper, and the transition of the dislocation structure is strongly retarded in the MnCu alloy compared with copper. These results can be explained by the mechanism of elastic anisotropy on the dislocation dynamics, as the elastic anisotropy in the MnCu alloy is larger than that in copper, which can strongly retard the multiplication of the dislocation population and the transformation of the dislocation structure. These results are important for research into the plastic working behavior of Mn–Cu–Ni–Fe high damping alloy.     

稀土对ZA27合金阻尼性能的影响

研究了稀土对ZA27合金阻尼性能的影响规律。结果表明：稀土变质可提高ZA27合金的阻尼性能，经稀土变质后的试样，其内耗是未变质的试样的1．4倍。ZA27合金为发挥其阻尼作用，在频率高于70Hz时，效果明显，且经稀土变质后的试样强迫振动衰减效果比未变质的试样强。     

高温材料的阻尼特性实验研究

采用双悬臂梁试件,通过基础激励下的共振驻留法,开发了一套高温材料在真空环境下的阻尼测试系统。研究了提高测试精度的方法,并分析了空气阻尼对阻尼测试结果的影响,并以Ti-6-4合金为对象,研究了阻尼随温度、应变幅值及振动频率的变化规律     

EFFECT OF ANNEALING ON DAMPING CAPACITIES OF AS-CAST ZA27 ALLOY

1. Introduction Because ZA27 alloy possesses excellent mechanical properties and high damping capacities, it is widely used in industries. ZA27 alloy has good castability and can be easily cast into various castings by permanent mold casting. The solidification of ZA27 alloy in the permanent mold can be considered to be a nonequilibrium process, and thus the supersaturated aluminum-rich ! phase and unstable copper-rich phase may also be found in the solidified ingot. Those nonequilibrium pha…     

EFFECTS OF TRACE Zr ON FATIGUE CRACK GROWTH RATE OF HIGH DAMPING Zn-Al ALLOY

ＥＦＦＥＣＴＳＯＦＴＲＡＣＥＺｒＯＮＦＡＴＩＧＵＥＣＲＡＣＫＧＲＯＷＴＨＲＡＴＥＯＦＨＩＧＨＤＡＭＰＩＮＧＺｎ－ＡｌＡＬＬＯＹ￥ＺｈｏｕＳｈａｎｃｈｕ；ＬｕｏＢｉｎｇｈｕｉ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅ...     

Interpretation of evaporation behavior of lead from molten copper by the mass-transfer model in fluid flow

Recently, an increasing tendency to eliminate the lead in alloy design has been found because of its harmfulness in health. The lead is required to be removed from copper scrap for recycling. In order to get fundamental knowledge on the use of cheap copper scrap in the manufacturing of lead-free copper alloy, the possibility of removal of lead by gas bubbling from the molten copper alloy has been investigated. The influence of Ar gas flow rate was investigated based on the reaction kinetics and mass transport model. The removal rate of lead was increased with an increase of flow rate of Ar and temperature. The overall removal rate of lead from the molten copper alloy has been calculated from experimental results, and the mass transport of lead in the gas phase (the absolute molar flux of lead) was calculated from the one-dimensional steady state diffusion model. The calculated mass flux of lead in the model is found to be quite similar to the overall removal rate of lead obtained from experimental results. The mass transport of lead vapor in the gas phase seems to be a major part of the rate-controlling steps, under the present experimental condition.     

ZL401合金的阻尼行为研究

对铸态ZL401合金进行了低温人工时效处理，利用低频内耗测试技术研究了合金的阻尼性能及实模量与应变振幅、频率和温度的关系，并与铸态合金进行了对比。发现合金阻尼与应变振幅及应变频率相关，随温度的提高而增大，且在低温和高温时合金阻尼与频率的关系出现了相反的变化。ZL401合金振动过程中实模量的亏损随频率的降低和温度的升高而增大。认为ZL401合金的阻尼行为是界面阻尼和位错阻尼二者效应叠加的结果，室温阻尼主要归功于位错阻尼，而高温阻尼主要归功于界面阻尼。     

Fe—Cr—Al—Si合金阻尼性能研究

采用倒扭摆内耗测试仪研究了Ｓｉ对Ｆｅ－Ｃｒ－Ａｌ减振合金阻尼性能的影响,结果表明：在Ｆｅ－Ｃｒ－Ａｌ中添加少量Ｓｉ（质量分数约为１％）或以Ｓｉ代替Ａｌ并经１２７３Ｋ及以下温度退火后,合金的阻尼性能（对数衰减率）优于Ｆｅ－Ｃｒ－Ａｌ,但经１２７３Ｋ以温度退火后,阻尼性能不及Ｆｅ－Ｃｒ－Ａｌ;以少量Ｓｉ代替Ｆｅ－Ｃｒ－Ａｌ中少量Ａｌ并经１３７３Ｋ以上温度退火空冷后,合金的阻尼性能比Ｆｅ－Ｃｒ－Ａｌ提高     

DAMPING CAPACITY OF HIGH SILICON ALLOY ZA27 PREPARED BY SPRM DEPOSITION

1.IntroductionInrecentyearscontinuousattemptshavebeenmade,particularlyinareasofalloydesignandadoptionofnovelprocesstechniques,todevelophighperformancematerialsasseriouscompetitorstotraditiona1engineeringalloys.Inparticular,muchattentionhasbeengiventoarapidsolidificationtechnique-spraydeposition.Itiswell-knownthatthisprocesshaJsimprovedthemechanicalpropertie8greatlyThosematerialsofferadvantagesinaPplicationswherehighdampingcapacityhighstrengthandhighstiffnessaxea..primaxyconcern.Highdampingal…