稀土、钛及热处理工艺对Zn-27Al合金耐蚀性的影响

本文研究了添加稀土元素 La、混合稀土(R·E)及钛元素对 Zn-27Al 合金耐蚀性能的影响,用扫描电镜观察了添加这些元素后合金中出现的化合物相,初步分析了这些化合物的形成过程及其对合金性能的影响。同时本文还探讨了热处理工艺改善 Zn-27Al 合金耐蚀性的可行性,讨论了添加元素—合金组织—相变—耐蚀性之间的关系。     

Zn—27Wt%Al合金中化合物相的分析

报道了在Zn-27AI合金中添加稀土及钦元素后出现在二全中的化合物的成分,初步分析了这些化合物的形成过程。     

稀土对易切削黄铜铅形貌影响的电镜考察

本文采用扫描电镜、能谱分析,定量金相仪等测试手段,研究了稀土元素对易切削黄铜中铅粒子的大小、形状和分布的影响。结果表明:添加适量稀土有细化铅粒子的作用,对α铅黄铜中铅粒子的形状和分布位置无明显影响,但对β和(α β)铅黄铜有促使更多铅粒子存在于β相中的倾向。     

Identification of Rare Earth Phase in the Deformed High Lead-Brasses

Deformed high lead-brasses have excellent machining characteristics and good mechanical and physicalproperties.They are widely used in mechanical,clock-watch and pen-making field.Especially,they are suit-able for deep-hole machining.Because of their worse hot-working characteristics,there exists trouble inproduction process.It is reported that the rare earth metals could improve the hot-rolling property,but themechanism is still unclear.     

Zn—AL合金的性能变化与显微组织的关系

本文采用扫描电镜、透射电镜观察了Zn—27wt％Al合金的铸态组织及其120℃的时效组织,测定了120℃时效过程中硬度随时效时间变化的关系曲线,分析了性能变化与组织转变之间的关系。     

Effect of the Rare Earths on the High Temperature Properties of Deformed Leaded-Brasses

The effect of the rare earths on the high temperature properties of deformed leaded-brasses has been stu-died with the high temperature tensile test.The results show that the rare earth additives can increase elongationof alloys at high temperature,but they had little effect on the maximum flow stress.With the help of SEM.X-ray diffraction instrument,quantitative metallography analysis instrument,etc.,the effect of the rare earthelements on the mierostrueture of alloys has also been examined.     

提高冷凝器用锡黄铜耐蚀性的研究

采用国际标准腐蚀试验方法（ＩＳＯ６５０９－１９８１）探讨添加元素对ＨＳｎ７０－１黄铜耐蚀性能的影响，找到了剧毒元素砷的替代方法。研究表明，稀土，锑均能明显改善ＨＳｎ７０－１合金的耐蚀性；同时添加稀土，锑，铝的ＨＳｎ７０－１合金其耐蚀性与加砷的相当，是目前加砷ＨＳｎ７０－１合金的合适替代材料。