Tb在快速凝固Ag合金中固溶度扩展

采用电弧熔化快速锤砧急冷技术制备含Tb直到10at.-%的Ag-Tb合金箔,厚度0.05—0.08mm,其冷却速度为10~6K/s数量级,采用晶格参数法确定Tb在快速凝固Ag-Tb合金中亚稳扩展固溶度可达到5at-%,确定亚稳共晶中的第二相为Ag_3Tb,观察了快凝Ag-Tb合金的显微结构与缺陷。     

Cu对Al-Li合金组织结构与性能的影响SCIEI

本文研究了3种Cu/Li比的Al-Li-Cu-Zr合金的时效析出组织及其性能。结果表明,实验合金时效由两级硬化过程所组成,其中第一级硬化是δ′相(3号合金为δ′+T_1相)强化而引起;第二级硬化是由于δ′+T_1(3号合金为δ′+T_1+θ′)的复合强化作用。当T_1相板条与δ′相颗粒相遇时,δ′相逐渐被T_1相吞并。Cu/Li比增加,合金的强(硬)度上升,但塑性下降,拉伸断口由穿晶变为沿晶形式,这与高Cu/Li比合金中晶界析出平衡相有关。     

Nd-Fe-B三元系相图的研究 Ⅰ.室温等温截面

观察了Nd-Fe-B三元合金铸态与均匀化处理后的金相组织,并进行了微区成分分析和物相鉴定。确定了Nd-Fe-B成分三角在室温下的各个平衡相区,绘制了该三元系在室温下的等温截面相图。     

Ti和V对Fe中氢与位错交互作用的影响

研究了Fe-0.5wt-%Ti和Fe-0.5wt-%V合金中由氢与位错交互作用所形成的氢致冷加工内耗峰(H-CWP)。实验结果表明:合金元素对H-CWP、对氢与位错之间的交互作用有显著的影响,与氢作用愈强的元素,对H-CWP的影响愈大,内耗实验结果与力学性能之间存在着一定的联系.     

SELECTION OF THE PROCESS PARAMETERS FOR BATH AUTOGENOUS SMELTING OF COPPER

The process parameters for bath autogenous smelting of copper were selected based on dynamic analysis of the experimental data and calculation of the mathematical model. Selecting the slag composition of SiO_2/Fe=0.80 and CaO％=16. desulphur ratio less than 80 wt.-％ in system. and the copper content of matte less than 60 wt.-％, it is able to limit Fe_3O_4 formation and obtain a high desulphurization. The critical oxygen content of the blast increased with decrease of the sulphur content of the concentrate and increase of copper contents of the matte. If the copper contents of the concentrate are respectively of 30 and 35 wt.-％, the critical oxygen contents of the blast will be 48 and 69 wt.-％ respectively. The smelling rate increases linearly with the blast intensity. When the sulphur content of the concentrate is 30 wt.-％, the oxygen content of the blast 70 vol.-％ and the copper content of the matte 60 wt.-％, a blast intensityy of 700 Nm~3/m~2·h results in a smeling rate of 48.81 t/m~2·d.     

HIGH RESOLUTION STUDY OF TWINS IN Al_(20)Cu_2Mn_3 PHASE

The dispersoid phase Al_(20)Cu_2Mn_3 in a 2024 Al alloy is commonly composed of twins,An ob-servation of corresponding high resolution image shows that the twin boundary plane is a glideplane other than mirror one.Two neighbouring components of twins are not symmetry of re-flection or rotation,but of glide reflection.The“diamond”glide plane is(101)and the glidevector is(1/4)(-).Components of twins in the phase take shape of prism with thelongitudinal edge being parallel to[010]and side faces being{101}and{100}.     

高炉低钛渣脱硫的动力学研究SCIEI

研究了高炉低钛渣脱硫的动力学,用扫描电镜初步研究了硫在渣铁界面附近的分布。结果表明,在无搅拌条件下,脱硫反应为一级反应;硫在渣中扩散为脱硫反应过程的限制环节,提出了提高脱硫反应速度的措施。     

MODEL OF CLEAVAGE CRACK PROPAGATION ACROSS BOUNDARY

In the light of analysis of the features of cleavage fractographs of low carbon steel,the stresscriterion for cleavage crack propagation across ferrite grain boundary was established on thesupposition that resistance to the propagation results from an arbitrary mutual orientation ofthe cleavage plans in the neighbouring grains.On the basis of concept of statistical distribu-tion of cleavage plane in space,the probabilistic characteristic of cleavage process was ex-pounded,and the fracture stress of the cracked specimen over temperature range in whichfracture is initiated by cleavage mechanism was calculated by means of finite element analysisprogram and the calculated result was found to be in agreement with that measured.     

THE CARBONITRIDE IN GAS CARBONITRIDING LAYER ON 18CrMnNiMoA STEEL

本文以电解提取-化学分离-X射线衍射逐层相分析及电子显微镜观察、电于衍射、化学分析等综合方法,研究了18CrMnNiMoA钢的气体碳氮共渗层中碳氮化物的形貌、结构、数量、组成、沿渗层的分布以及合金元素在各相间的分配,并对碳氮共渗层的强化机制作了某些讨论.     

板料多道次拉深成形规律和性能的研究

在物理模拟的基础上，研究了板料拉深成形过程中，材料的性能参数和工艺参数对板料成形性能的影响，着重分析了对多道次拉深成形的影响。结果表明，无论是材料性能参数还是材料的工艺参数都对再拉深的影响比对单道次拉深的影响林大得多，但两种参数对多道次拉深的影响过程前后是一致的。同时可以看出，多道次拉深之间是相互影响的，不能割裂开来考虑。