Ce对Al-Ni-Zr合金的非晶形成能力及力学性能的影响  

Effect of Ce content on glass-forming ability and mechanical properties of Al-Ni-Zr alloys

作　　者：李晓峰[1] 刘祖铭[1] 黄立清[1] 吴宏[1] 郭薇[1] 苏鹏飞[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2014年第2期211-217,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家高技术研究发展计划(863计划)资助项目(2009AA03Z526);国家自然科学基金创新群体项目(51021063)

摘　　要：加入Ce部分取代Al84Ni10Zr6合金中的Zr，用单辊旋淬法制备Al84Ni10Zr6-xCex（x=0～6，%）合金，利用X射线衍射、差示扫描量热和纳米压痕等试验分析方法研究Ce取代Zr对Al84Ni10Zr6合金的非晶形成能力及力学性能的影响。结果表明，用Ce代Zr可有效抑制α-Al、Al3Ni等初生晶体的形成，提高合金的非晶形成能力、显微硬度和弹性模量。x=0时，Al84Ni10Zr6合金具有完全晶体结构，显微硬度和弹性模量都较低。x=1～5时，合金具有晶体＋非晶复合结构，增加Ce含量，则初生晶体相减少，合金的显微硬度和弹性模量提高。x=6时，Al84Ni10Ce6合金具有完全非晶态结构，显微硬度和弹性模量最高，分别达到4.29和94.99 GPa。x≥3时，合金出现明显的玻璃转变现象，过冷液相区ΔTx为11～16 K，约化玻璃转变温度Trg为0.46～0.48。The Ce was substituted for Zr to produce the Al84Ni10Zr6-xCex（x=0～6, at%） alloy ribbons with using single roller melt-spinning at a wheel speed of 30 m/s. The effect of Ce on the glass-forming ability （GFA） and mechanical properties were investigated by using X-ray diffraction （XRD）, differential scanning calorimetry （DSC）, and nanoindentation, etc. The results show that Ce can effectively suppress the formation of primary crystallines （such as α-Al and Al3Ni） in melt-spinning of the Al84Ni10Zr6-xCex（x=0～6, at%） alloys, and enhance their GFA. The microhardness HV and elastic modulus E increased with increasing Ce contents in the Al84Ni10Zr6-xCex（x=0～6, at%） alloy ribbons. Al84Ni10Zr6 ribbon has a full polycrystalline structure with low microhardness and elastic modulus. The crystalline＋amorphous structures of the x=1~5 alloy ribbons were obtained, and their amorphous proportion, microhardness HV and elastic modulus E all increased with the Ce content. A fully amorphous structurewas obtained in Al84Ni10Ce6 ribbons, which has the highest microhardness of 4.29 GPa and elastic modulus of 94.99 GPa. The evident glass transition was observed in the Al84Ni10Zr6-xCex（x=0～6,at%） alloy ribbons for x≥3 , and their supercooled liquid regionsΔTx and reduced glass transition temperatures Trg are 11~16 K and 0.46~0.48, respectively.

关 键 词：铝基合金 非晶形成能力 弹性模量 显微硬度 

分 类 号：TF112[冶金工程—冶金物理化学] TG337[金属学及工艺—金属压力加工]