采用热模拟压缩试验研究了Ti-40阻燃钛合金在温度900℃～1100℃、应变速率0.01 s-1～10 s-1范围内的高温变形特性,发现合金的流动应力-应变曲线具有应力峰和流变软化特征,在高温、高应变速率下,出现不连续屈服现象.根据动态材料模型(DMM)建立的Ti-40合金加工图大致可以分为5个区域:(1)在温度900℃～950℃,应变速率大于1 s-1时,易发生45°角剪切开裂,出现明显的剪切变形带,功率耗散率达最小值.(2)在温度1000℃～1100℃、应变速率大于1 s-1时,易出现"豆腐渣"式和纵向开裂,大变形时出现局部塑性流动.这2个区域为流动失稳区,在制定热加工工艺时应尽量避免.(3)在高温(≥1050℃)、低应变速率区(≤0.1 s-1),功率耗散率为46%～76%,达到最大值,呈现连续再结晶的特征.(4)在900℃～950℃、应变速率0.01 s-1～0.1 s-1区域内主要发生动态回复,功率耗散率为22%～32%.(5)在温度950℃～1050℃、应变速率0.1 s-1～1 s-1范围为再结晶区域,功率耗散率为36%～50%.结果表明,加工图是控制材料组织演变和优化工艺的一种有效手段.
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