Mssbauer Studies of the Atomic Short-Range Order (SRO) and the Electron Transfer in Amorphous TM-M Alloys

The Mossbauer spectra of amorphous alloys Fe_(80)B_(20)-_xM_x (M=P, C, Si, Ge) at room temperature and at 4.2 K have been measured. It is found that the mean values of the hyperfine field and the isomer shift vary linearly when M substitutes for B. According to these results and those of their crystalline counterparts, it is shown that there does not exist a microcrystalline short-range order in the amorphous alloys investigated and that thc 4s electrons of iron take part in lhe charge transfer.     

CAS工艺合金熔化与溶解过程调查及实验

炉外精炼ＣＡＳ操作的一个主要的优越性就是合金收得率较常规吹氩法大大提高，但实际 调查表明，铝的回收率并未达到最佳，而且合金回收率的波也比较严重，这些问题均给实际操作带来困难，本文针对这些问题从理论和实验两方面进行了探讨，给出优化操作的一些基本考虑。     

添加钇对TiAl合金组织和性能的影响

设计并熔炼了成分为（Ｔｉ５０Ａｌ５０）１００－ｘＹｘ（ａｔｏｍ）＝０－２．０％）的合金，用金相显微镜、扫描电镜、三点弯曲试验等手段，研究了添加钇（Ｙ）对ＴｉＡｌ合金显微组织和力学性能的影响。结果表明：２的添加能改变ＴｉＡｌ合金中Ｏ、Ｎ等间隙原子含量并增加ＴｉＡｌ合金显微组织，使γＴｉＡｌ使合金晶粒细化，促进γ＋α２片层状组织的形成，适量钇的添加能降低ＴｉＡｌ合金中Ｏ、Ｎ等间隙原子含量并增加ＴｉＡｌ     

工业雷管连续爆速动态测量

本文通过外阻丝传感器测试了工业雷管连续爆轰速度.获得了8~#无起爆药和6~#有起爆药热丝电雷管的“爆速——时间”波剖面曲线,该曲线表征了工业雷管黑索今装药爆轰波的传播.     

碲镁磷对过共晶铝硅合金中硅相形貌的影响

本文通过在高纯过共晶Al-Si合金中调整Te、Mg、P加入量的试验,研究Te对含Mg的Al-Si合金铸态硅相形貌的影响。结果表明,Te、Mg、P中任何一种元素占优势时,都能以该元素为主影响合金的组织形态。     

Fe-0.64at％Ti二元合金系统低温氮化内耗峰谱的研究

系统地测量了400℃氯化的Fe-0.64Ti合金系统不同热处理制度下异常内耗峰的行为.提出了230℃峰的Ti-N_2仨缺陷模型,指出了100—150℃峰与高温时效过程中在{100}_α面上形成富钛、氮的预沉淀相紧密相关.     

Landau theory of martensitic transformation in Fe-Mn-Si based alloys

Considering the features of martensitic transformation in Fe-Mn-Si based alloys, the Landau theory is established by introducing the density of stacking faults as a new order parameter ηand the corresponding free energy function. By using such an order parameter, the stacking fault mechanism of the nucleation and growth for the γ(fcc)→ε(hcp) martensitic transformation can be reasonably explained, and a further detailed mechanism is proposed. The stacking faults are generated and overlapped in an irregular form at the beginning and then becoming regular to create some transition structures till a stable phase forms at a certain temperature. The importance of the interface soliton is to complete the transformations into various structures of martensite but not the twinned one. The thermodynamics of fcc→hcp transformation and those between different transition structures are described by the free energy function established in the present note.     

钨铜合金/铬青铜复合结构电触头的超塑焊接

探讨利用恒温超塑焊接代替真空扩散焊接实现W80Cu20/QCr0.5-0.2-0.1复合结构电触头焊接加工的可行性。试验结果表明:在预压应力56.6MPa、焊接温度800~830℃、保温30min、初始应变速率1.5×10-2min-1的条件下,经5~7min的压接,接头抗拉强度(最高达190.8MPa)均高于真空扩散焊,并且无需真空或保护气氛,焊接温度较低,效率较高,在复合结构电触头的焊接加工中有良好应用前景。     

5种偶氮染料溶液的光催化降解实验

以TiO2为催化剂,采用中压汞灯为光源对5种偶氮染料溶液进行了光催化降解的实验研究。结果表明,在上述条件下能够使直接R-F,直接黄y-5 GL,直接耐晒翠蓝B-GL,阳离子B-2RL,直接耐晒蓝B-BRL等偶氮染料水溶液降解脱色,染料脱色为动力学一级反应。5种偶氮染料在初始浓度50mg/L,温度201℃下,经20min光照,其脱色率分别为97.01%、97.90%、88.13%、96.95%、95.74%;CODCr去除率分别为58.64%、40.61%、44.60%、44.71%、55.56%。并讨论了pH值、催化剂用量、脱色时间和染料结构等因素对脱色与降解的影响。     

硫酸法钛白粉生产中的废副综合利用

钛白粉是重要的无机化工颜料,其生产主要采用硫酸法和氯化法.硫酸法生产钛白粉废副多,本文对我国硫酸法钛白生产中的废副综合利用情况进行了综述并指出了今后发展的方向.