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Introduction
范海洋 研机械1702 学号:S1703051
吴轲 研机械1702 学号:S1703053
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experimentally investigated.
然后，实验研究了刀具转速对FSWed板的表面外观，微观结构和力学 性能的影响。
Specialized Term 专业术语
The motivation of the study 研究动机
Contents of the study 研究内容
PPT模板下载：www.1ppt.com/moban/ 节日PPT模板：www.1ppt.com/jieri/ PPT背景图片：www.1ppt.com/beijing/ 优秀PPT下载：www.1ppt.com/xiazai/ Word教程： www.1ppt.com/word/ 资料下载：www.1ppt.com/ziliao/ 范文下载：www.1ppt.com/fanwen/ 教案下载：www.1ppt.com/jiaoan/
Introduction
①W.B. Liu et al. investigated the nano-crystallization and microstructure ①W百度文库B. Liu 等人研究了在退火热处理
evolution of quenched RAFM steel produced by means of surface mechanical attrition treatment(SMAT) during annealing heat treatment. ②
mechanical properties of metallic materials over coarse grained metallic materials due to the large volume fraction of grain boundaries in the matrix, some techniques have been developed to induce nano-structures. ⑤However, the nano-structures will lose its advantages with grain boundaries decreasing under elevated temperatures, which directly restrict its application in high temperature environment. ⑥Investigation on the thermal stability of nanocrystalline is meaningful for extensive use of nanocrystallized metal material. ⑦Therefore, extensive researches on the thermal stability of nano-crystalline materials have been conducted.
行业PPT模板：www.1ppt.com/hangye/ PPT素材下载：www.1ppt.com/sucai/ PPT图表下载：www.1ppt.com/tubiao/ PPT教程： www.1ppt.com/powerpoint/ Excel教程：www.1ppt.com/excel/ PPT课件下载：www.1ppt.com/kejian/ 试卷下载：www.1ppt.com/shiti/ PPT论坛：www.1ppt.cn
Welding Institute (TWI) in 1991[6] .
特别是对于铝和镁合金，自从1991年焊接研究所（TWI）发明摩擦搅
拌焊接（ FSW ）以来，FSW已经作为一种新的固态焊接技术而受到充
分的研究。
Specialized Term
Formal Style
专业术语
正式风格
In this study, A5052-O aluminum alloy plates were friction-stir-welded (FSWed).
在本研究中，将A5052-O铝合金板进行摩擦搅拌焊接（FSWed）。
And then, the influences of the tool rotation speed on surface appearance,
microstructure and mechanical properties of the FSWed plates were
摩擦搅拌焊接（FSW）是焊接各种金属材料具有吸引力的技术之一。
Especially for aluminum[1-3]and magnesium[4-5]alloys, the FSW has been actively
studied as a new solid state welding technique, since it was invented by The
Much attention,therefore, has been focused on aluminum and magnesium alloys because of a wide variety of unique properties, especially low density properties. 因此，由于铝和镁合金其独特的性能，特别是低密度的性能，从而受 到人们的广泛关注。
For their practical applications, bonding and welding technologies should also be established aside from alloy design,microstructure control, plastic forming, casting, surface treatment, etc. 在实际应用中，还应从合金设计、微观组织控制、塑性成形、铸造、 表面处理等方面建立连接和焊接技术。
In their study, rapid grain growth was observed after annealing for 5min at 823K on account of the release of residual stress. ③A. Bachmaier and
过程中通过表面机械磨损处理 （SAMT）生产的淬火RAFM钢的纳米
Essay topic: Thermal stability of surface nanocrystallization layer in AZ91D magnesium alloy induced
by laser shock peening
论文题目： AZ91D镁合金的表层纳米结晶化在激光冲击下的热稳定性
吴轲
研机械1702
学号:S1703053
Introduction
①Magnesium alloys, especially magnesium-aluminum alloys, are extensively used in the electronic, automotive and aerospace industries due to their low density and high strength-to-weight ratio. ②Among the various magnesium alloys, AZ91D used here is the most common commercial Mg alloy because of its best combination of mechanical properties and castability. ③However, magnesium alloys usually exhibit inferior high temperature properties and poor corrosion resistance, which seriously limit their potential use in industrial practice. ④Since that the surface nano-crystallization significantly strengthens the physical and
结晶和微观结构演变。②在研究中， 由于残余应力的释放，在823K的温度 下退火5分钟后观察到快速的晶粒增
Motz found that nanostructure in alloyed Co materials showed a better 长。③A.Bachmaier和Motz发现，与
stability compared with single-phase high purity Co. ④The introduced
Essay topic: Friction stir welding of 5052 aluminum alloy plates
论文题目： 5052铝合金板的搅拌摩擦焊
范海洋 研机械1702 学号:S1703051
Introduction
Recently, requirements for the automotive industry have been increasing due to its reduction in mass, fuel consumption and environmental impact. 最近，由于汽车重量，燃料消耗和环境影响的减少，汽车行业的需求 一直在增加。
The background of the study
研究背景
Introduction
Friction stir welding (FSW) is one of the attractive technologies for welding of a
wide variety of metallic materials.
①镁合金，尤其是镁铝合金因其低密 度和高重量强度比而广泛应用于电子 业，汽车业和航空航天业。②在各种 镁合金中，此处使用的AZ91D镁合金 由于较好的力学性能和铸造性能组合 而成为最常见的商业用镁合金。③然 而，镁合金通常表现出较差的耐高温 性和抗腐蚀性极大地限制了它在工业 生产中的潜在用途。④由于粗糙金属 材料在基体上的晶界体积较大，因此 表面纳米结晶显著地增强了金属材料 的物理和力学性能，从而已经开发了 一些诱导纳米结构技术。⑤然而，在 高温条件下，纳米结构将失去其优势， 这将直接限制它在高温环境下的应用。 ⑥所以纳米晶体热稳定性的研究对纳 米晶体材料的广泛应用具有重要意义。 ⑦因此，研究人员对纳米晶体材料的 热稳定性进行了广泛的研究。
单相高纯度钴相比，合金钴材料中的
nanometer sized pores could significantly improve the thermal stability of 纳米结构显示出更好的稳定性。④引
范海洋 研机械1702 学号:S1703051
吴轲 研机械1702 学号:S1703053
PPT模板下载：www.1ppt.com/moban/ 节日PPT模板：www.1ppt.com/jieri/ PPT背景图片：www.1ppt.com/beijing/ 优秀PPT下载：www.1ppt.com/xiazai/ Word教程： www.1ppt.com/word/ 资料下载：www.1ppt.com/ziliao/ 范文下载：www.1ppt.com/fanwen/ 教案下载：www.1ppt.com/jiaoan/
行业PPT模板：www.1ppt.com/hangye/ PPT素材下载：www.1ppt.com/sucai/ PPT图表下载：www.1ppt.com/tubiao/ PPT教程： www.1ppt.com/powerpoint/ Excel教程：www.1ppt.com/excel/ PPT课件下载：www.1ppt.com/kejian/ 试卷下载：www.1ppt.com/shiti/ PPT论坛：www.1ppt.cn
experimentally investigated.
然后，实验研究了刀具转速对FSWed板的表面外观，微观结构和力学 性能的影响。
Specialized Term 专业术语
The motivation of the study 研究动机
Contents of the study 研究内容
PPT模板下载：www.1ppt.com/moban/ 节日PPT模板：www.1ppt.com/jieri/ PPT背景图片：www.1ppt.com/beijing/ 优秀PPT下载：www.1ppt.com/xiazai/ Word教程： www.1ppt.com/word/ 资料下载：www.1ppt.com/ziliao/ 范文下载：www.1ppt.com/fanwen/ 教案下载：www.1ppt.com/jiaoan/
Introduction
①W.B. Liu et al. investigated the nano-crystallization and microstructure ①W百度文库B. Liu 等人研究了在退火热处理
evolution of quenched RAFM steel produced by means of surface mechanical attrition treatment(SMAT) during annealing heat treatment. ②
mechanical properties of metallic materials over coarse grained metallic materials due to the large volume fraction of grain boundaries in the matrix, some techniques have been developed to induce nano-structures. ⑤However, the nano-structures will lose its advantages with grain boundaries decreasing under elevated temperatures, which directly restrict its application in high temperature environment. ⑥Investigation on the thermal stability of nanocrystalline is meaningful for extensive use of nanocrystallized metal material. ⑦Therefore, extensive researches on the thermal stability of nano-crystalline materials have been conducted.
行业PPT模板：www.1ppt.com/hangye/ PPT素材下载：www.1ppt.com/sucai/ PPT图表下载：www.1ppt.com/tubiao/ PPT教程： www.1ppt.com/powerpoint/ Excel教程：www.1ppt.com/excel/ PPT课件下载：www.1ppt.com/kejian/ 试卷下载：www.1ppt.com/shiti/ PPT论坛：www.1ppt.cn
Welding Institute (TWI) in 1991[6] .
特别是对于铝和镁合金，自从1991年焊接研究所（TWI）发明摩擦搅
拌焊接（ FSW ）以来，FSW已经作为一种新的固态焊接技术而受到充
分的研究。
Specialized Term
Formal Style
专业术语
正式风格
In this study, A5052-O aluminum alloy plates were friction-stir-welded (FSWed).
在本研究中，将A5052-O铝合金板进行摩擦搅拌焊接（FSWed）。
And then, the influences of the tool rotation speed on surface appearance,
microstructure and mechanical properties of the FSWed plates were
摩擦搅拌焊接（FSW）是焊接各种金属材料具有吸引力的技术之一。
Especially for aluminum[1-3]and magnesium[4-5]alloys, the FSW has been actively
studied as a new solid state welding technique, since it was invented by The
Much attention,therefore, has been focused on aluminum and magnesium alloys because of a wide variety of unique properties, especially low density properties. 因此，由于铝和镁合金其独特的性能，特别是低密度的性能，从而受 到人们的广泛关注。
For their practical applications, bonding and welding technologies should also be established aside from alloy design,microstructure control, plastic forming, casting, surface treatment, etc. 在实际应用中，还应从合金设计、微观组织控制、塑性成形、铸造、 表面处理等方面建立连接和焊接技术。
In their study, rapid grain growth was observed after annealing for 5min at 823K on account of the release of residual stress. ③A. Bachmaier and
过程中通过表面机械磨损处理 （SAMT）生产的淬火RAFM钢的纳米
Essay topic: Thermal stability of surface nanocrystallization layer in AZ91D magnesium alloy induced
by laser shock peening
论文题目： AZ91D镁合金的表层纳米结晶化在激光冲击下的热稳定性
吴轲
研机械1702
学号:S1703053
Introduction
①Magnesium alloys, especially magnesium-aluminum alloys, are extensively used in the electronic, automotive and aerospace industries due to their low density and high strength-to-weight ratio. ②Among the various magnesium alloys, AZ91D used here is the most common commercial Mg alloy because of its best combination of mechanical properties and castability. ③However, magnesium alloys usually exhibit inferior high temperature properties and poor corrosion resistance, which seriously limit their potential use in industrial practice. ④Since that the surface nano-crystallization significantly strengthens the physical and
结晶和微观结构演变。②在研究中， 由于残余应力的释放，在823K的温度 下退火5分钟后观察到快速的晶粒增
Motz found that nanostructure in alloyed Co materials showed a better 长。③A.Bachmaier和Motz发现，与
stability compared with single-phase high purity Co. ④The introduced
Essay topic: Friction stir welding of 5052 aluminum alloy plates
论文题目： 5052铝合金板的搅拌摩擦焊
范海洋 研机械1702 学号:S1703051
Introduction
Recently, requirements for the automotive industry have been increasing due to its reduction in mass, fuel consumption and environmental impact. 最近，由于汽车重量，燃料消耗和环境影响的减少，汽车行业的需求 一直在增加。
The background of the study
研究背景
Introduction
Friction stir welding (FSW) is one of the attractive technologies for welding of a
wide variety of metallic materials.
①镁合金，尤其是镁铝合金因其低密 度和高重量强度比而广泛应用于电子 业，汽车业和航空航天业。②在各种 镁合金中，此处使用的AZ91D镁合金 由于较好的力学性能和铸造性能组合 而成为最常见的商业用镁合金。③然 而，镁合金通常表现出较差的耐高温 性和抗腐蚀性极大地限制了它在工业 生产中的潜在用途。④由于粗糙金属 材料在基体上的晶界体积较大，因此 表面纳米结晶显著地增强了金属材料 的物理和力学性能，从而已经开发了 一些诱导纳米结构技术。⑤然而，在 高温条件下，纳米结构将失去其优势， 这将直接限制它在高温环境下的应用。 ⑥所以纳米晶体热稳定性的研究对纳 米晶体材料的广泛应用具有重要意义。 ⑦因此，研究人员对纳米晶体材料的 热稳定性进行了广泛的研究。
单相高纯度钴相比，合金钴材料中的
nanometer sized pores could significantly improve the thermal stability of 纳米结构显示出更好的稳定性。④引