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that the addition of RE to A356 alloys containing Ti and/or B and Sr makes strength and elongation increase in T6 treatment, but make elongation decrease in T5 treatment, at the same time, the long axis of α... of silicon particles in T5 treatment is higher than that in T6 treatment. A356 alloys modified and refined with Ti, B and Sr obtain the best mechanical properties in T5 treatment, however, the alloys with Ti......
Conception of tooling adapted to thixoforging of high solid fraction hot-crack-sensitive aluminium alloys G. VANEETVELD1, A. RASSILI1, J. C. PIERRET1, J. LECOMTE-BECKERS2 1. Thixo Unit, B56... Received 13 May 2010; accepted 25 June 2010 Abstract: Thixoforging is a type of semi-solid metal processing at high solid fraction (0.7<φs<1), which involves the processing of alloys in the semi......
Interaction of crack with twins in hot-rolling AZ31 magnesium alloys during in-situ TEM straining experiments WU Luo-yi(吴落义)1, WU Cui-lan(伍翠兰)1, XIA Wei-jun(夏伟军)2, CHEN Zhen-hua(陈振华)2 1. Center..., subsequently the cracks extend into adjacent grains across grain boundaries, and grow along cleavage plane. Multiple twins are observed in hot-rolling AZ31 magnesium alloys, when cracks propagate......
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, Ti-Al alloys with coexistence of FCC and HCP structures [9-12]. However, there is little research on alloys in BCC structure by the theory. The purpose of the present work is to choose Nb-Mo alloys... Trans. Nonferrous Met. Soc. China 22(2012) 1190-1196 Characteristic atom sequences of Nb-Mo alloys system in BCC structure and properties of disordered alloys PENG Hong-jian1,2, WU Qing1, LI......
Ni-Ti活性钎焊高纯Al2O3界面反应微观机理 张春光1,金志浩1,乔冠军1 (1.西安交通大学,陕西西安,710049) 摘要:基于部分液相瞬间连接工艺,采用NiTi活性钎焊技术实现了高纯Al2O3陶瓷与可伐合金(4J33Kovar)的气密性封接.采用微观组织分析,微区成分分析和X射线衍射分析等方法,研究了封接反应的微观机理.研究结果表明,氧化铝陶瓷中的氧扩散进入焊料中,在焊料/Al2O3界面形成了Ni2Ti4O反应层,厚度1μm~2μm,起到了陶瓷晶格到金属晶格的过渡作用. 关键词:氧化铝; 活性钎焊; 反应机理; Ni2Ti4O; [全文内容正在添加中] ......
phenomena in quaternary Cu-Al-Ni-Ti shape memory alloys [J]. Le Journal de Physique Colloques, 1982, 43: 761-766. [11] ASTM. Copper and copper alloys [S]. 2001. [12] European Copper Institute. Copper... of microstructural and corrosion characteristics of quaternary shape memory alloys Cu-Al-Ni-X (X=Mn or Ti) [J]. Transactions of Nonferrous Metals Society of China, 2015, 25: 1158-1170. [20] GUSTMANN T, DOS SANTOS......
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析出相形态对Ni-Ti形状记忆合金力学性能的影响刘金旭1,胡丹丹2,郑秀华1,李树奎11. 北京理工大学2. 北京矿冶研究总院摘 要:对室温奥氏体相NiTi形状记忆合金进行热处理,在300和500℃时效温度下,分别获得具有粒状和针状Ni4Ti3析出相的组织特征,对两种组织的合金进行准静态和动态力学性能研究,对比分析析出相形态对奥氏体NiTi形状记忆合金静动态力学行为的影响规律.结果表明,准静态拉伸加载下,随应变率的提高,两种组织的应力诱发马氏体相变过程均呈现明显的应变率效应,对比分析发现,针状组织的NiTi合金发生应力诱发马氏体相变的初始应力值低,材料塑性好,抗拉强度高;准静态压缩加载时,两种组织的力学性能相近;动态压缩加载时,针状组织的动态压缩屈服强度显著高于粒状组织,但是由于粒状组织马氏体塑性变形......
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