摘要
研究了250℃时不同拉伸速率对高强耐热镁稀土合金Mg-12Gd-2Y-Sm-0.5Zr强度的影响,对时效态合金的显微组织进行了观察分析。结果发现:在研究范围内,拉伸速率对合金力学性能有一定影响,在250℃条件下,随着随拉伸速率从0.5 mm/min升高到4 mm/min,屈服强度有所提高,合金抗拉强度先升高后降低,拉伸速率为2 mm/min时抗拉强度达到最大值314.6 MPa。研究认为,拉伸速率通过改变合金的形变强化及裂纹扩展行为对合金的力学性能产生影响。
The tensile strength of Mg-12Gd-2Y-Sm-0. 5Zr alloy with superior mechanical properties at room and elevated temperature was investigated in differential tensile rates. The microstructure of alloy was then investigated after solution and aging treatment（ i. e.,T6 heat treatment）. The results show that,with increasing tensile rates from 0. 5 mm / min to 4 mm / min at 250 ℃,the yield strength increases slightly,and the ultimate tensile strength increases and reaches to the maximum 314. 6MPa at 2 mm / min. The tensile rate has effect on the mechanical properties of aged experimental alloy via changing strain hardening and crack propagation mechanism.
出处
《稀土》
EI
CAS
CSCD
北大核心
2014年第2期54-57,共4页
Chinese Rare Earths
基金
浙江省公益性技术应用研究计划项目(2011C31030)
台州职业技术学院重要研究项目(2013ZD01)
