镁及复合变质对高硅铝合金的热膨胀及力学性能的影响  被引量:3

Effects of Mg and Compound Modification on Thermal Expansion and Mechanical Properties of High Si Aluminum Alloy

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作  者:吴树森[1] 钟鼓[1] 姜华文[1] 万里[1] 安萍[1] 毛有武[1] 

机构地区:[1]华中科技大学材料成形与模具技术国家重点实验室

出  处:《特种铸造及有色合金》2009年第9期788-791,共4页Special Casting & Nonferrous Alloys

基  金:国家高技术研究发展计划(863计划)资助项目(2007AA03Z557)

摘  要:研究了Al-20Si-2Cu-1Ni-xMg合金的热膨胀性及其组织与性能。结果表明,Mg含量在0.4%左右时,P与RE复合变质的高硅铝合金热膨胀系数为17.4×10-6℃-1;T6热处理能够显著提高含Mg合金的抗拉强度,Mg含量为0.4%左右时抗拉强度达到最大值。加Mg后在热处理时析出Mg2Si等弥散强化相是强度提高的主要原因。采用P-RE复合变质时,能同时细化初晶Si及共晶Si,但Mg含量对初晶Si的P变质效果的影响不明显。高硅铝合金的拉伸断口形貌表现为铝基体的韧性断裂和Si颗粒的脆性断裂共存的混合断裂方式。Thermal expansion,mechanical properties and microstructure of Al-20Si-1Ni-xMg alloys were described. The results reveal that,with 0.4% Mg content,thermal expansion coefficient of the high Si aluminum alloy modified by P and RE reaches 17.4×10-6/℃. The tensile strength of the alloy containing Mg can be greatly improved after T6 heat treatment,where the maximum value can be observed with approximately 0.4% Mg content,which is attributed to the precipitation of Mg2Si phase during heat treatment. Both primary Si phase and eutectic Si phase can be refined with P-RE compound modification,however,the Mg content has not obvious effects on P-modified primary Si phase. The fracture morphology of the high Si aluminum alloy is characterized by mixed rupture modes of ductile rupture of Al matrix and brittle rupture of Si particle.

关 键 词:高硅铝合金 显微组织 力学性能 变质 热膨胀 

分 类 号:TG131[一般工业技术—材料科学与工程]

 

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